Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4528de26f412ce…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 06:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fee2c2a487a098f0ec6cf5abfba72e65 SHA-1: ec24eeb328e2bd059283f5500069a1bf9109b1bf SHA-256: 8a4528de26f412ce4e8e3282cca0db7ed4ecb020b25f3ccd01cd531140d59563
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded JavaScript, though not fully detailed, further supports its role as a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=chapter+3+great+gatsby+pdf PDF link annotation
    • http://jajolamuseku.medianewsonline.com/13627309044.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/harbor_freight_scroll_saw_vs_wen_scroll_saw.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/RhdOijF/magic_coloring_coloring_pages_color_by_number_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/hjfqgfM/audio_beats_pro_apk_latest.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371020/normal_5fe2a16582648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5feba07477d11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_602cae55a439c.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/65100542475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_6047b99349477.pdfIn PDF document text
    • http://interbank.link/bernina_1090_sewing_machine_parts04c9u.pdfIn PDF document text
    • http://docita.fun/free_alright_now_tab6ycyl.pdfIn PDF document text
    • http://wamuterireted.iblogger.org/peputetukomiropes.pdfIn PDF document text
    • http://fionainthefield.org/earth_magic_oracle_cards_meaningsi8z6t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_5fd885d00e78e.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/qPhbJON/nerezujoxaxumakobojim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekuxibasor.rf.gd/xuwugi.pdfIn PDF document text
    • http://lunuganuxik.epizy.com/14593458700.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/export_with_bleed_indesign.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/vexovobakixogeni.pdfIn PDF document text
    • http://geladafifalisak.epizy.com/zusufibogomovotuta.pdfIn PDF document text
    • http://napubuxuwel.epizy.com/rukapoxuwoguba.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_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 5584 bytes
SHA-256: 766a831a3a2152fcf4b3c168c3d3f79edf7d5e0326ab24e28cd44ec0ee876e23
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 11312 bytes
SHA-256: 369d4ea878b4ab3744956373c20438fb71fac9792b645cc2649b78416f87a61c

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