Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5039fae4c54ca6…

MALICIOUS

PDF

78.5 KB Created: 2021-03-13 20:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77a7bd5ddbab86e817bd533edb70aad3 SHA-1: e8da4ab932c6ba0de0a871c53322639c0903ecac SHA-256: ef5039fae4c54ca66869b0ff3c5631c42f23f0f7df507effee3f5deeea7408bc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by a machine learning classifier and ClamAV as malicious. The primary external URI points to a URL that appears to be part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a textbook, which is a common tactic for spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=biology+science+for+life+6th+edition+pdf
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/33edf37764174f.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6033262f98197.pdf
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/7699147.pdf
    • https://static.s123-cdn-static.com/uploads/4386361/normal_5fe569ea7ee2e.pdf
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/9596868.pdf
    • https://cdn-cms.f-static.net/uploads/4454671/normal_601b7ba01ac4a.pdf
    • https://cdn-cms.f-static.net/uploads/4383445/normal_60277bc7731db.pdf
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/25ad2.pdf
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff4fe8255193.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuwimadaneb/63971812098.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_ef06d7bce183461baa133d14e457498f.pdf?index=true
    • http://tawegoju.rf.gd/zaruluk.pdf
    • http://novoniranalisa.epizy.com/pojividuze.pdf
    • https://s3.amazonaws.com/sojenozap/86485664296.pdf
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_c9ba1cb5d9734750b903b166410f9041.pdf?index=true
    • http://zedofizanotigip.epizy.com/2012_chevy_silverado_lt_specs.pdf
    • https://s3.amazonaws.com/juzewojavomofew/veduxipilipekexu.pdf
    • https://s3.amazonaws.com/kelageketisefuv/story_of_beauty_and_the_beast_in_hindi.pdf
    • https://s3.amazonaws.com/votuweroxigezog/44624968248.pdf
    • http://dupumimegijema.epizy.com/sizejek.pdf
    • http://nawexox.epizy.com/agricultural_economics_and_agribusiness.pdf
    • https://s3.amazonaws.com/rixevozajixezos/1996_buick_riviera_performance_parts.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_off0000f3dd.bin
6f491fa8c6e39e4b4b8967c3a9bad96c070c3a65ec1d048f935cda867dbbe122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 5512 bytes
font_01_sfnt_off000106a9.bin
3a024e78c9d23c1d8511591f44a6daf8c761d481ac34067225a3520a41b15bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 11076 bytes

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