Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45e1c6ff7d6e4e6…

MALICIOUS

PDF

71.5 KB Created: 2021-02-20 00:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d85d6f3afc162ea09e87b46aaefea90f SHA-1: 02c3a3b8095483bc7f942224c29a66232d94494d SHA-256: a45e1c6ff7d6e4e6cab1846b915823f65e07b77b20033b8b6cc3b28045919ba9
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits multiple indicators of malicious activity, including a high ML classification score and ClamAV detection as a phishing trojan. It contains a link farm with numerous external URLs, many hosted on disposable domains, and specifically targets Microsoft branding for credential phishing. The document's structure and embedded links suggest an attempt to redirect users to malicious sites, likely to download further payloads or steal credentials.

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://pufukowog.weebly.com/uploads/1/3/4/5/134583281/fozikul.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://maypoin.ru/strik?utm_term=central+fl+vegetable+gardening+guide PDF link annotation
    • http://nevoxodaw.66ghz.com/juzofusuvatisopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_6009c1856dca3.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/fozikul.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/3135722.pdfIn PDF document text
    • http://online-bestshop.xyz/download_divergent_2_sub_indonxj4d.pdfIn PDF document text
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/gilurajidipizeta.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/filusiguritefovifum.pdfIn PDF document text
    • http://serviceforyou.site/86564021123r3l38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5fe0fb0d809d7.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/ac17eb86.pdfIn PDF document text
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/mopolajiso.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/8356109.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/giwutozerozurufuza.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/7986951.pdfIn PDF document text
    • https://roxupexuwukobeb.weebly.com/uploads/1/3/4/7/134749027/porejuna.pdfIn PDF document text
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/jidudatipela.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/aa4cc111d083.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rejoritobelimid.epizy.com/cyber_security_awareness_campaign.pdfIn PDF document text
    • http://bowomufe.epizy.com/wagadibepu.pdfIn PDF document text
    • http://tuxiwifu.rf.gd/whiteboard_animation_app_for_android_free.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 5000 bytes
SHA-256: 23a68d8911198dce2e54a6f69ceafba3f0ba32827db26f03ad7471c38825732b
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 10092 bytes
SHA-256: 6f252fed83b6e229d43808ef139513e2f9908e09f57a78fe1c4f499b86d3f29a

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