Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc9a47e1243b34e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-26 00:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1a617a7b883db37dd2c6829bfb0558ba SHA-1: 180001de2f1ae5160ac7a26ad992c46c188948ca SHA-256: edc9a47e1243b34e1d62131d8fb174440db4101b9c7c9d9de857dce73680d0f7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=chemistry+book+for+neet+pdf PDF link annotation
    • https://cdn.sqhk.co/dorusafe/cgdifAh/sesijosagidigelok.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/gfggjf8/kusesunexakutefikovizagol.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/5JfP6z5/zimuvoxebogimevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_6016cb161fcaa.pdfIn PDF document text
    • https://tidurikax.weebly.com/uploads/1/3/1/8/131856133/wokegobefisififi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5fd0f82605bc4.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/8c2d39.pdfIn PDF document text
    • https://sevebara.weebly.com/uploads/1/3/4/5/134501605/061ee5d.pdfIn PDF document text
    • https://vawavujak.weebly.com/uploads/1/3/4/3/134350312/820965.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/OzigD1I/barbie_dreamhouse_adventures_episode_6.pdfIn PDF document text
    • https://robedovetukurur.weebly.com/uploads/1/3/4/7/134754045/9602ca8bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_604845e658e50.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5ffa814fd3655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_68c758e02fc04782b438c1939a7c0c68.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_a1e8e209acc54969b97739b4443385f4.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_689e9d535c194cf3adf78ccaa164919d.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_2710d3b728774a7ab6ae84180d92f110.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_fa7963e57e7b49b6aef0821fbbb48352.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_525a98e7b94040ca9b3a06fceec3ed29.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_82e4cebfda8c4d908b8af91ca52c05ca.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_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 5248 bytes
SHA-256: b9c26af4205ffd29cb0bd13d464cb25f143c48382e46b924824027a85283eeb9
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 10896 bytes
SHA-256: 0652aaffdb99d66572b2a70af295178d7783b2606f387e89da84f3750c2c4f0a