Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62609df3835664c…

MALICIOUS

PDF

74.5 KB Created: 2021-03-29 17:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6d13b270e6aff0f7bf17c9e7596bb265 SHA-1: 788f6bd25e99aee06c5db0a6a5605a979ff98a6e SHA-256: f62609df3835664c382a64ffcd54751a111f2a31222aae3e35889e9364f09b0a
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=rational+male+religion+audiobook PDF link annotation
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/8868325.pdfIn PDF document text
    • https://birugenok.weebly.com/uploads/1/3/4/6/134632973/6591792.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/xagawalawaziw.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/7736433.pdfIn PDF document text
    • https://cdn.sqhk.co/jewezaledev/figOEhb/89114053170.pdfIn PDF document text
    • https://guwopatuzigumi.weebly.com/uploads/1/3/4/3/134334434/297d9297408.pdfIn PDF document text
    • https://naxabofufakuwo.weebly.com/uploads/1/3/4/3/134330868/begeri.pdfIn PDF document text
    • https://bunekapizo.weebly.com/uploads/1/3/0/9/130969144/bigozobibusedepokix.pdfIn PDF document text
    • https://wovogivas.weebly.com/uploads/1/3/4/0/134012667/922d211d6d489.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/hjiihgI/international_pizza_day_2020_nz.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/8906610.pdfIn PDF document text
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/9838751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_6567dcbc486a42dca031b852d5538176.pdf?index=trueIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_b98a5a11648047148a0e758b3d028407.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc44ba01-d4c4-4050-b59d-4e3e53ece93a/anaconda_jupyter_notebook_-_change_working_directory_windows.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_ae4209f805704587ac359bcdebd980e4.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_3497547434c24461953fae9ef864e878.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad4bac2-3dad-401f-a327-8a0294270bdc/62034486259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e7b2bc-a18a-4ea3-93a4-1851b66434d6/how_to_disable_key_fob_alarm.pdfIn 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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 5180 bytes
SHA-256: b5e99850cc87a2ab20d3bb1c726281334c40e247842336b92e7e2a8179fec878
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 11004 bytes
SHA-256: 9b481c8f6152f62c053c0f65a29e87a349750ac0de527dc0cb37621bfc2219e6

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