Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54fee19e59323d3…

MALICIOUS

PDF

72.0 KB Created: 2021-03-27 23:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ace7d19fd6c7bfb0dacea57ec2bf210 SHA-1: 2111b80a718fc1489c8adc9db6097140f1d3e0ba SHA-256: d54fee19e59323d3926b0ceaf4bb703c4724956953d6bc97382f8cb3f6e6e795
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=free+lettering+practice+worksheets+from+tombow PDF link annotation
    • https://jekazaneret.weebly.com/uploads/1/3/1/4/131455475/kokiladutamukaze.pdfIn PDF document text
    • http://gatorama.fun/18400081205bopwu.pdfIn PDF document text
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/4871249.pdfIn PDF document text
    • http://xviiivbgz.com/walodixajulpiwh5.pdfIn PDF document text
    • https://gupolakeg.weebly.com/uploads/1/3/1/8/131871569/9603847.pdfIn PDF document text
    • https://ferugagesavisux.weebly.com/uploads/1/3/4/6/134687542/vuwanig-mujitagididefe-widulizesu-binojuzesuna.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/zidenigad/mubuparis.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/important_question_answer_of_deep_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3580de9-b512-4dd6-b9f9-ddceaf121839/gmat_coaching_classes_in_chennai.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_7b6d8a22898341a6bffb50ba55eb3bc8.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_b0a0201ce34f49d99b67c0998fdd940b.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_cdabfa5de84947e692680d7f94c06ea5.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_3c5daad03f8741a785b073a08e54bb2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/383e69b7-f3d3-42e5-837f-cb5919aa6741/1580473933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34eeeae2-eb03-4e97-9a38-4269b24ee82a/craftsman_leaf_blower_19.2_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be412a7b-cab3-45f2-a0a5-393be067afb0/jilebujejozobiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6e402f-70c7-4b44-bac3-026d4b91a28d/94019238205.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_35aa8569acba47fbb838f5bb99ea963c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 5680 bytes
SHA-256: fb58a4d7cef022d33b34818fda6d6545f4fa75dde0eec28abae97b95be911cd5
font_01_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 10800 bytes
SHA-256: e0dd9b2141cd1ff5259f4405dfd4082178feafe052635719903e8f2bab331564

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