Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eb4e8eb9b16fa8…

MALICIOUS

PDF

81.9 KB Created: 2021-03-23 12:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: de4a2e55d4e7a46485363d9e9754ca1a SHA-1: 670f15db3dbffba4fa329f525cadcc8114d826be SHA-256: 88eb4e8eb9b16fa8d467a4364844de34a50870f6a3174287bf425ecd5c77f312
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest malicious content, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/award?keyword=ferraillage+escalier+b%25C3%25A9ton+arm%25C3%25A9+pdf PDF link annotation
    • https://febasenijig.weebly.com/uploads/1/3/1/3/131379808/rikel.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/5d670.pdfIn PDF document text
    • https://nugekiva.weebly.com/uploads/1/3/5/3/135322430/kamato.pdfIn PDF document text
    • https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/31eab3.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/7606afb785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/diwuzelofasaga.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_16e92cb20a9a42c680457f9d81bbbe41.pdf?index=trueIn PDF document text
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_83ed91c2d9b041cfb9c99b6c63fc4eb8.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_7b79fcbfe8d6466eb60df76fd16d2043.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b1c0a1-9c9b-45ae-b34f-e30da78d92be/xosufino.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/does_burger_king_have_whoppers_for_breakfast.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/aggiornare_android_asus_transformer_tf101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef7202a-a635-4219-bb15-96b7b83063fd/dopojiwemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efd5b4b-41fc-4b1d-b458-b9a8d82f488c/samsung_dishwasher_dw80f600uts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/93112479846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8163b4e5-6e22-4274-8404-2d63bdadb54b/how_to_do_fodmap_elimination_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/aruba_305_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8ef3d8-6dd5-443d-a7da-f52ebef15678/animal_imagery_in_wuthering_heights.pdfIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_8c2d5333f6644f59abf30b1bd8e3a62e.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_8eedf81d147b4864a2f4fbaf74fb8081.pdf?index=trueIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_bf4bf45acc57422b8001fafbfe44e1d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47931db-0989-4544-8983-35a14dfc46c5/why_is_it_important_to_recycle_paper_and_cardboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6514cd23-3f15-47f4-93e6-641b9831ada1/91626375987.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_77717dd4adc14056b7939025622c4bf0.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_988ac0a3a4174c2084a33a4fcdbf6553.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_06e421d7617646049cb86e36b03a32ce.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 5712 bytes
SHA-256: b4098e83c2eb5e22bf22c0af5649a9ab04a73d0da22a108f844c4b21425a3a8b
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 12144 bytes
SHA-256: 4a4c498d0b7ede7e42d575613503ee17eb835bc0ed9348f9f1ad3afb62f35ad5

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