Malicious PDF — malware analysis report

Static analysis result for SHA-256 874f823082c91f0e…

MALICIOUS

PDF

70.1 KB Created: 2021-03-17 08:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 76c2f225406ef5cc78600f219d0f7cfa SHA-1: b6821207b64e787421acdfc92117b065e051b4cb SHA-256: 874f823082c91f0ea1b539159bee7c518bb5933d85155ff3899c36102701b3ac
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to a worksheet, likely intended to trick users into clicking the embedded links.

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://midufefew.ru/wix?keyword=a+streetcar+named+desire+worksheet PDF link annotation
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/nakovadewofage_begitovufi.pdfIn PDF document text
    • https://mumasibomogavap.weebly.com/uploads/1/3/1/0/131070301/7743565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_603356f75d4cd.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/b3icgjJ/26181099905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fee08782968a.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/igjdjjk/xukebutifine.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/jejjaia/dr._davey_hand_sanitizer.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/548eac82e90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367635/normal_5feaf95e0e2e0.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/1847982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_603b587776a3f.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/lirigaforag_rifulufuvuw_wozatevikeno_sadinofopoji.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/igehjXt/xosago.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/idjczje/making_cake_frosting_with_cool_whip.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/jaFspje/bullet_force_download.pdfIn PDF document text
    • http://muzojumovove.iblogger.org/vodop.pdfIn PDF document text
    • http://xubatazu.22web.org/9738669729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teruwizirazi.rf.gd/20835086896.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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 5292 bytes
SHA-256: f1ef37958f453bd2642eac2a7c93c55ed26fcee013f2840a8c0d9e094505b92c
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 10592 bytes
SHA-256: 4ad0b3d5b5dfc2df043fb63e683cd0f2931c6492a9bf7800361dba5c1cea2b50

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