Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdbc9177e8c5bf8…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 11:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 82c789e9226730954e5bb5c89695fba7 SHA-1: 9146fa31e1925127ebcfb158bb4360e5aca5b0a2 SHA-256: 8cdbc9177e8c5bf8fbff8c40f8eda9b1e28445af869977c7468e8b4415fd0817
186 Risk Score

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 0.9990

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://midufefew.ru/award?keyword=hip+arthritis+stretches+pdf PDF link annotation
    • http://xidasetetobuge.scienceontheweb.net/actividades_de_espaol_y_matematicas_para_segundo_grado_de_primaria.pdfIn PDF document text
    • http://baugroup.info/28547758203nn0ov.pdfIn PDF document text
    • https://kowokilu.weebly.com/uploads/1/3/0/7/130740572/numase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_5fd7459c36765.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/zedemipofolaz_fizinuv_rikisomepefoz.pdfIn PDF document text
    • http://prosucre.pro/logitech_wireless_gamepad_f710_not_workingwjwm3.pdfIn PDF document text
    • http://oneitstore.info/kitelazewuzejugunujunurysy1w.pdfIn PDF document text
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/gonibit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_6034fc1a5a6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_604a019eb5526.pdfIn PDF document text
    • https://serijarivak.weebly.com/uploads/1/3/0/7/130776739/lozixe.pdfIn PDF document text
    • http://masterpowerpoint.com/69183325171fggae.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/fedipuwugijumif.pdfIn PDF document text
    • http://reduslimitaly-official.website/kiforarovilolalari20x.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/lamoxonukogu-sedodafewokas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_60489182586c7.pdfIn PDF document text
    • https://gunefadube.weebly.com/uploads/1/3/5/3/135388078/wosum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_5fdadb7f53ee9.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/8289966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirigofov.atwebpages.com/celsius_conversion_chart.pdfIn PDF document text
    • http://defakulid.atwebpages.com/sbl_abbreviations_for_books_of_the_bible.pdfIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_32404860a47943a18d505c5b179e3647.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_cc3e093fc10b4714b4ef2cec505d5f3d.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_8032aa0b831d47519fdbd49357756910.pdf?index=trueIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_619611b1efdc4623a72d4717ebf75d88.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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 5172 bytes
SHA-256: 440eeb54289b611668253395efe314895ce6ae40b647e1f9dc6dee30198a77f1
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10688 bytes
SHA-256: 972571dd487f733ead3a4d90544fb6bf81fdfe7d48d4108cd5b9d175a2949a08