Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4072532a387de1a…

MALICIOUS

PDF

85.6 KB Created: 2021-05-19 23:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4640b0c44260c83177b548406c9faee8 SHA-1: d4ed5bf5895e0fd6d06909af846b2e7acc1baaf0 SHA-256: b4072532a387de1a5169dc7063374a53885998d732019185cd792663cff96aa7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The embedded URLs, such as 'https://fokemale.ru/strik?utm_term=top+10+vr+games+for+oculus+quest+2', are likely used to redirect users to malicious websites. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=top+10+vr+games+for+oculus+quest+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500417/normal_5fd3c14e2a2da.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/benafasinafo.pdfIn PDF document text
    • https://suxosuliresud.weebly.com/uploads/1/3/5/3/135351283/vizaworofutunolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_5ffb7c1b95da8.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/wurasikijoniniw.pdfIn PDF document text
    • https://manonerotorupu.weebly.com/uploads/1/3/4/6/134683358/vimewadevesax.pdfIn PDF document text
    • https://lurugidapu.weebly.com/uploads/1/3/4/3/134315770/zotikubudewem-lofuki-peguduzi-barasimajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390074/normal_5feb5d54aaa4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fc77a163ba1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/geradi/ninja_professional_blender_900_watts_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/vesenelijulunipoxiruxu.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/80613010229.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/womegok.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/28042130883.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/pdf_split_candy.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/wofipubazamowuzemudi.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/bsf_study_questions_acts_lesson_25_day_4.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/belikapuruxuvamimu.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/facebook_like_bot_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/23756477630.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/battle_angel_alita_volume_3_cbz.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/black_ice_fennec_rocket_league_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/buguxosere.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/amazon_forest_fire_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 5524 bytes
SHA-256: 40837c6c859a32d743c47726fdbc5b277221fc7514b2fda0aaa27c798f0f5555
font_01_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 11144 bytes
SHA-256: 37c4ee435cbdc5192fc6f3788f673788d2bdd3f4c397f4f27e53993c40488832
font_02_sfnt_off0001387d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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