Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dc77a05afc37cf…

MALICIOUS

PDF

75.3 KB Created: 2021-01-06 15:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e3ad21082f2c937c0e000e48661a0b95 SHA-1: c4a0d9d7d71a30e5c7c53ce24285ab5af8dfd374 SHA-256: 41dc77a05afc37cf04f09e05aad5987074e3f1c0152247a3f3432918511f5273
246 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 ClamAV and an ML classifier, exhibiting characteristics of credential phishing. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies a Facebook impersonation lure pointing to a redirector URL.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/lamejoxokavujis.pdf.
  • 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://traffnew.ru/aws?utm_term=score+hero+hacked+version+2019 PDF link annotation
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/lamejoxokavujis.pdfIn PDF document text
    • https://sabadefupi.weebly.com/uploads/1/3/4/3/134345863/8be8b8f582c3bf.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/zenawiko-gozakubenatej-lefetarefe-vobuxenekizes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5fe66a488b03e.pdfIn PDF document text
    • https://vebuxevofarina.weebly.com/uploads/1/3/4/0/134013543/mijogowijipamovixase.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxugaveg/gfSiihj/coin_master_hack_without_verification_code.pdfIn PDF document text
    • https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/4322325.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/cnhghg8/t-_mobile_for_business_pos_promo_code.pdfIn PDF document text
    • https://xomijati.weebly.com/uploads/1/3/5/3/135329577/5277258.pdfIn PDF document text
    • https://fanuxerejupu.weebly.com/uploads/1/3/1/3/131398214/fb2a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5f9ed6dd437a3.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/jw3jgVm/54827527722.pdfIn PDF document text
    • https://kokemigigumuv.weebly.com/uploads/1/3/4/0/134042371/6589249.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/kudefem/65715322050.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/15582424195.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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 5704 bytes
SHA-256: f7e699157bc4560267dffdd58bf86bf97dd0a52d2022498ac282f719a4bcfcfc
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 10176 bytes
SHA-256: 04e421dd53b8efcca6a4d4edbd3d8601a7f51e4421a6e5c021711457d0557ef8

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