Malicious PDF — malware analysis report

Static analysis result for SHA-256 18731e1e409d9414…

MALICIOUS

PDF

72.1 KB Created: 2021-03-17 03:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 287b8ae71dd7922c7d65d2d079102690 SHA-1: a278a7a45ced9415db403b3855ab78ef09df0a24 SHA-256: 18731e1e409d941419408da4b3ba9b13fb42ee88c71f1ad6f2a720493d14a9af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable domains. This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=sub+zero+refrigerator+parts+list PDF link annotation
    • http://vk-settings-change.online/alkyl_halides_iit_jee_questionsxqwjl.pdfIn PDF document text
    • https://dosevabif.weebly.com/uploads/1/3/1/6/131637409/woxomafusefusurur.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/848bf70f14.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/vagibagevateju.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/hhd1ag3/75209450232.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/5df2235.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/gEidEF0/62476769152.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/kuraraxoralen_kigeranawozufup.pdfIn PDF document text
    • https://vosumizajemuji.weebly.com/uploads/1/3/4/0/134041682/b9570f1d418.pdfIn PDF document text
    • http://blockingscenery.com/548372629612wlrt.pdfIn PDF document text
    • https://nalelijuw.weebly.com/uploads/1/3/4/5/134512153/bbe868a316e7.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/gym_workout_schedule_for_beginners_with_pictures.pdfIn PDF document text
    • https://lolivifi.weebly.com/uploads/1/3/0/7/130739590/folovurarowatas_sudezogetiwi.pdfIn PDF document text
    • http://parkji5x.xyz/samsung_xpress_m2835dw_hard_resetr1rz7.pdfIn PDF document text
    • http://tryraisins.club/vedevuvuzu7l886.pdfIn PDF document text
    • http://normab-id.com/428512501662w26p.pdfIn PDF document text
    • http://smartbright.club/face_mask_pattern_around_head_elasticcay42.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/iechdhh/91515662011.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/sikuvukuwafopefefifi.pdfIn PDF document text
    • http://domsale.xyz/48590527808chivm.pdfIn PDF document text
    • https://buxapuwale.weebly.com/uploads/1/3/2/8/132815799/mubuneruv-jivojavad-defubovijidu.pdfIn PDF document text
    • http://zibodotuf.mygamesonline.org/99986026011.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/YX1Yf9n/nefukagodomogamoluwiku.pdfIn PDF document text
    • http://fc-aromat.ru/tasopukivajijumsuc1q.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5360 bytes
SHA-256: cdfe8e624cb69fe3ef1e44b20771bb2d792a65c03533c3e91299c1d10e28a6af
font_01_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 11144 bytes
SHA-256: f03010dea08d439ebaebce3088bbc597e24a94b57898d1bf8d856c001fe71e77