Malicious PDF — malware analysis report

Static analysis result for SHA-256 960822c57a1e636a…

MALICIOUS

PDF

72.5 KB Created: 2021-06-09 06:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fb4f6583ba9e1ac2d39dfd96a137b1e4 SHA-1: 3c4fd108f84f5e8a33418082574860fb504378b1 SHA-256: 960822c57a1e636a20ad2d1c4d72633f733c6c5384fc150004ba761697a133c2
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious link farm, containing numerous external links to other PDFs hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/pbw?utm_term=iti+kand+pdf+free+download PDF link annotation
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/dajinamutalaj.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/weludugafebubulileba.pdfIn PDF document text
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/bidiwabafaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_605ac91270c0f.pdfIn PDF document text
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/voxajibafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_60640f4ca4ec5.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/fezes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_601b35926c92e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_600662756ce9d.pdfIn PDF document text
    • https://lizimiligamib.weebly.com/uploads/1/3/4/5/134584059/neriwasitefakarur.pdfIn PDF document text
    • https://zufonarupidib.weebly.com/uploads/1/3/4/7/134721949/d914ad322.pdfIn PDF document text
    • https://suzibosefibowu.weebly.com/uploads/1/3/4/8/134883218/vifajazafut-lunupo-jotawamezek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481847/normal_60b8864424359.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/3533536.pdfIn PDF document text
    • https://bezaxopev.weebly.com/uploads/1/3/0/7/130740011/rulenaxana-remet-mapodagitof-fufikek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488566/normal_5fc7368fac0fb.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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 4952 bytes
SHA-256: 44a6c43291127f39d58f942f51ac6359f5cda83a6cc5199a0ce6b7603f0d47ac
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 11052 bytes
SHA-256: b5f84a7916fe734590c9d73df76ccc3ef18534f0baef14791f428706967905d0

Open this report in the interactive analyzer, or submit your own file for analysis.