Malicious PDF — malware analysis report

Static analysis result for SHA-256 581ab5527debb161…

MALICIOUS

PDF

88.2 KB Created: 2021-05-13 16:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0236548d4383130006994302df81235e SHA-1: e16b76db03d0332b2c284b520d62629c35748cd8 SHA-256: 581ab5527debb16160669d39b2f9a7f86c9b7eeaceb90d1523924d251d48dd11
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 by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, with the PDF_URI heuristic pointing to a potential distribution point. While no scripts were explicitly extracted, the nature of the link farm and the high confidence score suggest it may be used to deliver further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cdn.sqhk.co/pabilere/geJTvkh/22273593709.pdf In PDF document text
    • https://vozupixog.weebly.com/uploads/1/3/4/3/134312338/9138630.pdfIn PDF document text
    • http://tirudibemaj.22web.org/bidisowufek.pdfIn PDF document text
    • http://rujajabejeveto.66ghz.com/gcf_word_problems_with_answers.pdfIn PDF document text
    • https://deminoki.weebly.com/uploads/1/3/5/3/135310913/ronujekobapuxotogugi.pdfIn PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/4054136.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/icbVNbY/radodijinekijugasul.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/16577426137.pdfIn PDF document text
    • http://soteguziropuku.22web.org/serato_dj_pro_2.2_beta_download_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=the%20tragical%20history%20of%20doctor%20faustus%20act%201%20summaryPDF link annotation
    • https://uploads.strikinglycdn.com/files/3d157852-47df-4b8e-b00a-e769d5d77e2e/daduteveta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743606f9-2d6e-4119-a9e7-5858f55779fc/zerepipujiveza.pdfIn PDF document text
    • http://gozipoxux.rf.gd/topographic_map_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6454fb-5ecc-47b1-87bc-091331ebde73/5162276124.pdfIn PDF document text
    • http://savekuf.rf.gd/2244504276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5018348-929a-4546-845e-2033e4eab5a5/brinkmann_smoker_and_grill_parts.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_93e94d043ce84163a605dad58520090c.pdf?index=trueIn PDF document text
    • http://lujemibezigan.epizy.com/national_song_of_pakistan_free.pdfIn PDF document text
    • http://jodolevuvik.epizy.com/namifeperavug.pdfIn PDF document text
    • http://namerunu.rf.gd/paint_3d_free_for_windows_8._1.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_438f6f856f4a483d934103524c0cb11a.pdf?index=trueIn PDF document text
    • http://fejuzezoj.epizy.com/sisalupadezoditodufanus.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_673b01f18ad24f72bd373e445c05d8c1.pdf?index=trueIn 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_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 5540 bytes
SHA-256: 17d28a7a3175f1cbb784f8a48a446d93e542fb8eb9d0d190b1c2962ecfe7f325
font_01_sfnt_off00012c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 11592 bytes
SHA-256: eecb9b93e41b17b6be125274028699367163f158ad3ac558273fcf84cba9bd4f