Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b3ff7e0340169e…

MALICIOUS

PDF

74.4 KB Created: 2021-02-16 06:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0170c1c75db89832c8e3173b3c12f85d SHA-1: 157124372fd7ff1600affdada4451f2b66685a02 SHA-256: 77b3ff7e0340169e8437222e4a1a0982898b51e0996e651232020ea23138ebeb
244 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 multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of a link to known malicious redirector infrastructure further supports this assessment. No scripts were extracted, but the overall structure and embedded links point towards a phishing or content distribution attack.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+did+transcendentalists+believe+about+nature In PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/wuxonovugogelula.pdfIn PDF document text
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/1760628.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/68a58b402006203.pdfIn PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/a1ce40996.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/vawivepewumazukono.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/chgjguv/baweniwevezunu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/lgzhan9/las_vegas_city_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/LhgeOll/talking_tom_and_friends_rabbit.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/eMM5Pia/lobekokiji.pdfIn PDF document text
    • https://cdn.sqhk.co/bodavadu/higgUhc/deck_heroes_legacy_mod_apk_2019.pdfIn PDF document text
    • https://vanonages.weebly.com/uploads/1/3/6/0/136083008/xofimifubopebazo.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/wafipurodadex.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/hfjhXhd/four_planets_in_retrograde_october_2020.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/8772363.pdfIn PDF document text
    • https://rixedevo.weebly.com/uploads/1/3/5/3/135306589/vegoxabazakoveb-xabetuzosagexo-xosudazitolapa-zuloz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5fecf56c5d989.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/6442378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 5240 bytes
SHA-256: c6ff5a7afcdbaf01a57e28c8acb3d2aa9060fe7227a82ec2dea7d2b604ff19f6
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10592 bytes
SHA-256: 6907e22d87564a313dfaec8b182972f6222b0fc57a7e56e5be37f53e8ec60046

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