Malicious PDF — malware analysis report

Static analysis result for SHA-256 a828fb8182771f72…

MALICIOUS

PDF

87.9 KB Created: 2021-04-11 13:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3aa0b58f7c2a91e507fbeaa4e38306c8 SHA-1: cdfb910987a5a0921fedc64dfdece2230916bc71 SHA-256: a828fb8182771f722c3126085dd1dc925ebfa8e61209c54fe398cf40d2c9cc41
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 0.9997

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://xezojetit.ru/strik?utm_term=2003+saturn+vue+v6+fuel+filter+location PDF link annotation
    • http://yarrebitteh.online/adonit_jot_touch_4_manual2o0xz.pdfIn PDF document text
    • http://bluebadgeapproval.com/ludofuronojatokorhn8n7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_600c222fcdd05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_603b95ab4e00a.pdfIn PDF document text
    • http://kpovli.ru/kupijomuwizosuponate1nrc1.pdfIn PDF document text
    • https://zonujonuwug.weebly.com/uploads/1/3/4/3/134309714/pexiwaseje.pdfIn PDF document text
    • https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/8404546.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/gjgihaR/hoggy_2_jar_79.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/Chdgjhj/faxezabur.pdfIn PDF document text
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/9b55406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_60486e3081c46.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/JhaihCT/kunurakilinusimopebe.pdfIn PDF document text
    • http://accueilcmb.com/577244073270jn7x.pdfIn PDF document text
    • https://cdn.sqhk.co/womalakifaxa/ha78AqZ/fortinet_nse4_6._0_study_guide.pdfIn PDF document text
    • http://optalpha.com/99395382229mpe53.pdfIn PDF document text
    • http://shop50off.info/fibiwanamavivereruzah8len.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/p1J2Pie/flip_skater_mod_apk_android.pdfIn PDF document text
    • https://sedaduvu.weebly.com/uploads/1/3/4/5/134598683/6906854.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/haifjcj/fiji_airways_max_8_news.pdfIn PDF document text
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/b6e091a0abb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 5432 bytes
SHA-256: 2d9654241f6412928cf343f2d8b425aef72853f4744fccc45780baded821176d
font_01_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 11572 bytes
SHA-256: 2bb6681b0ff4276a80e611b71f592041e2764979d705c3c80f0972c0b23d2a09
font_02_sfnt_off00013d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1A 16108 bytes
SHA-256: 32f4f1f0b695e5d4615fbcad4b5b3a29e2120f680b26ad6392bb678d83ba1141

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