Malicious PDF — malware analysis report

Static analysis result for SHA-256 1213183cc23fad22…

MALICIOUS

PDF

75.8 KB Created: 2021-04-19 22:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ed6024c5450df9e76cf9c9b158ab4c89 SHA-1: 2832fee3745f85538fac5cf5ccc28bfdcfcfe8d3 SHA-256: 1213183cc23fad224b77c917543647347386ab7e951fadd8674a1bd2b25129cc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to lead users astray.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=how+to+pair+lg+wireless+headset PDF link annotation
    • https://ritixalasan.weebly.com/uploads/1/3/4/2/134265532/33a990.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/8590623.pdfIn PDF document text
    • http://healingtunes.ru/vifilisixadakufexaw3rmkz.pdfIn PDF document text
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/22cdf79725f.pdfIn PDF document text
    • https://xiruzavaxukegaf.weebly.com/uploads/1/3/5/3/135324830/7245302.pdfIn PDF document text
    • http://thefortykuti.com/37867238356lr4jw.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/jaluzojuf_seler_gadisowonaxoruj.pdfIn PDF document text
    • https://jevilorusijugif.weebly.com/uploads/1/3/0/8/130874204/segejiwepegoxu.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/zumufuba.pdfIn PDF document text
    • https://dovinaturaxamij.weebly.com/uploads/1/3/5/3/135349119/4486847.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/guxiwegekojomav-didefexos-gabumi.pdfIn PDF document text
    • https://tetarexaxamos.weebly.com/uploads/1/3/1/4/131483090/88f6449.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/zujogotufo-rimosoponag.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/4510868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/datarofapakil/chain_reaction_movie_parents_guide.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_47e9cdea0f494edd912433017a17981a.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_e7ea3d6c1be94fda8db5857225402b42.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_f5ced3ed2c1c482eac230c9765b79ce3.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_c16c1a4a8aec4af891a0abeef66e4e58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/14061324778.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_eeb170101fd847608a9b8886eacb1d7d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 4956 bytes
SHA-256: f1e148110810d107a8d98440306e7a658b47e9b807c6e2427ea42d4dc8db0a71
font_01_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 11844 bytes
SHA-256: 89e6d1cff1c87ddc155218c185d1e526ce6f494c6e6a8cd675fca49a1928a56e
font_02_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176