Malicious PDF — malware analysis report

Static analysis result for SHA-256 07afc20018f23769…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 15:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a4033d63e1f4f4113f5c638da3c40488 SHA-1: a6e255f6e23cc0fe5c92e6a228c0255ec0d2c261 SHA-256: 07afc20018f237698dd57c17fb179bda10594a5ff15d1a9fb53b9f9be67d5603
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather as a container for these links. The presence of many disposable domains and the PDF_SEO_LINK_FARM heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/award?keyword=cours+pour+apprendre+le+fran%25C3%25A7ais+pdf PDF link annotation
    • http://tronreserve.online/how_much_is_a_dell_latitude_e64303ljiq.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/aYVPggh/dinoland_zwolle_vanaf_station.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/iiihKi8/sevoluzeda.pdfIn PDF document text
    • https://cdn.sqhk.co/lewenowaxer/igcghgh/crafting_guide_albion_online.pdfIn PDF document text
    • http://modernstyle.pro/wokewovefu0a8jq.pdfIn PDF document text
    • http://onlinetyz.xyz/antivirus_mcafee_free_for_pctj33r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451556/normal_5fccf54f7e404.pdfIn PDF document text
    • https://cdn.sqhk.co/rapaxino/hiFgeSr/doppler_effect_problems_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_601e7d21c5a2a.pdfIn PDF document text
    • http://vamoktin.ru/49382662935q5b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_603cb2f3e4307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_6038d673efe5d.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/hfiaeic/71239611601.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/4513146.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/gigdjbe/kanelaliwu.pdfIn PDF document text
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/53251b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5ff3ead6ac8d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_604194f4205ae.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/tugubesekigudira.pdfIn PDF document text
    • http://mosdendy.store/entrepreneurship_and_small_business_management_study_guidev67ni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6049cfe09522e.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/eibtH0T/shin_chan_comedy_song_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/wjhi8ig/the_witch_s_isle_story.pdfIn PDF document text
    • https://zoliparudoluja.weebly.com/uploads/1/3/4/6/134662317/5175106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_60174c0308ea1.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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5120 bytes
SHA-256: ec95a5be5ff9460a1d379f87f19116faed3a8d3ce6be5794bb2c9605f212d976
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 12124 bytes
SHA-256: 20c1edcc00a46242ca0ecc319656d50a06c34e6de293a9b1443468887b2da9a5