Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f45a5198bc7ce7f…

MALICIOUS

PDF

80.3 KB Created: 2021-05-21 09:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06f862b067ebd6f1e7b1e3016b592c9c SHA-1: ddd37840cf45bf295e1c1a1dc5426b987e84527a SHA-256: 2f45a5198bc7ce7f9a042a70fc0443379d212d47233edf258ad52bb3733b9098
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning tactic. The primary external URI points to a suspicious domain, likely intended to lead users to malicious content or phishing pages. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=cavalier+king+charles+spaniel+welpen+deutschland
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/sofaraxadijajolugij.pdf
    • https://static.s123-cdn-static.com/uploads/4473890/normal_5fecfc833bc4e.pdf
    • https://cdn-cms.f-static.net/uploads/4412154/normal_604e31f1e524a.pdf
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/63fff.pdf
    • https://cdn-cms.f-static.net/uploads/4447436/normal_5fd81ffbd3891.pdf
    • https://fanevatonalusi.weebly.com/uploads/1/3/1/6/131637928/448531.pdf
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd26e9183080.pdf
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/dajeloja.pdf
    • https://cdn-cms.f-static.net/uploads/4467277/normal_60519bd84468e.pdf
    • https://tonezukem.weebly.com/uploads/1/3/5/3/135348251/sisulo-kexorijopifexit.pdf
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/c5414e2270.pdf
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/zodura-tutexevinuruw.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/3c351c.pdf
    • https://cdn-cms.f-static.net/uploads/4462376/normal_6014f4937eb18.pdf
    • https://pelofaneb.weebly.com/uploads/1/3/4/2/134235527/fajexiro-pifipenijikib-dogovugobokug.pdf
    • https://static.s123-cdn-static.com/uploads/4393508/normal_5fc91b261c2cf.pdf
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/9521664.pdf
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/380925.pdf
    • https://cdn-cms.f-static.net/uploads/4450890/normal_60506f665a01a.pdf
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/7611926.pdf
    • https://cdn-cms.f-static.net/uploads/4449184/normal_602cae347ef8b.pdf
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/nipelo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bubeto/73351998811.pdf
    • https://s3.amazonaws.com/lopadivupudexa/suzim.pdf
    • https://s3.amazonaws.com/mixanaz/cfa_program_curriculum_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f836.bin
da6bf68927ce9acd372c34441742be9ab17f41f2f340c3000cd93f9915daf060		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 5456 bytes
font_01_sfnt_off00010ad1.bin
2308f76c8bc2a6e25b8c6b65b9f4ace654dce533728a4cb42ef28936f521276c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 12012 bytes

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