Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0cfb2103bfce8a…

MALICIOUS

PDF

110.9 KB Created: 2021-06-06 15:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a550d2fc6ba4e1125ad7ae964bab3164 SHA-1: 9cdbed316bee81850ed1c7e73100d24cbee383cd SHA-256: bc0cfb2103bfce8a2cb316bcec3dfb4db830e0b27731fbc4613c83dec7d3a933
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://inwebjor.ru/pbw?utm_term=cuidados+mediatos+e+inmediatos+del+recien+nacido+por+enfermeria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393521/normal_6022543c2432e.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/tulufov.pdfIn PDF document text
    • https://memefuzagimo.weebly.com/uploads/1/3/4/6/134612336/9eddf57f8.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/lurorom-tutoni-zijuxepuzo.pdfIn PDF document text
    • https://nijodumedogale.weebly.com/uploads/1/3/6/0/136082157/mosomam.pdfIn PDF document text
    • https://wovuxekas.weebly.com/uploads/1/3/4/3/134379471/6422696.pdfIn PDF document text
    • https://lapenemelibi.weebly.com/uploads/1/3/4/7/134708636/towanufezudeninu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455670/normal_602c674446493.pdfIn PDF document text
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/mabefilawe-zosasuzopenum-relojewuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwivaj.pbworks.com/f/ostrich_meat_nutritional_value.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/f/nostradamus_book_tamil_free_download.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/f/26226589934.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144416484/13173010163.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/call_of_duty_black_ops_2_mac_os_x_download.pdfIn PDF document text
    • http://finatin.pbworks.com/f/13198313608.pdfIn PDF document text
    • http://medodadepud.pbworks.com/f/how_do_you_factory_reset_a_locked_motorola_phone.pdfIn PDF document text
    • http://wudiwiligis.pbworks.com/f/take_2_tablets_by_mouth_twice_daily_means.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_off00017492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17492 5208 bytes
SHA-256: a01a9487527962ad2d49f864d6963dcd4b755b18c17ac16f2dafb7edd00d1f71
font_01_sfnt_off00018628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18628 12236 bytes
SHA-256: bdabe15dda5b8ca4bbaceb70819c9af9d9a201cadac613f979e32d45dc5ebf3d

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