Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b3e6a5126fc99a…

MALICIOUS

PDF

143.2 KB Created: 2020-12-10 04:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efee5876a254d1798454659ead98c500 SHA-1: d6ca4c201798ad2cccd093b1338875a742e7d591 SHA-256: 00b3e6a5126fc99aa959a3b56fbafb0e389cb4a2b28a10fef245ccedc3af7bdb
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 point to other PDF files, suggesting a link farm designed for SEO manipulation or to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs, including one with a suspicious domain, points towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://traffset.ru/123?utm_term=mos+2013+study+guide+for+microsoft+powerpoint+pdf+download
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/7483851.pdf
    • https://cdn-cms.f-static.net/uploads/4462681/normal_5faf8af1cbcc5.pdf
    • https://sufewusog.weebly.com/uploads/1/3/4/6/134644796/d7b6b39b.pdf
    • https://cdn-cms.f-static.net/uploads/4476437/normal_5fb2d5651e272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc10c85bdb33045eec3233b/t/5fcd4bad5177ea328cd0fd66/1607289773485/peewee_longway_shootem_up_bang.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf671d3570fb44d1fae16e/1606379296439/70736630443.pdf
    • https://static1.squarespace.com/static/5fc37900ec917750a3e8073f/t/5fcda3b29aa2de0c64afe3bc/1607312307397/dimodekivirupegupedume.pdf
    • https://static1.squarespace.com/static/5fc2bc52c6229360ecb8cfc0/t/5fceca347cc0b10a0abdd53a/1607387700752/bleach_immortal_soul_character_release_order.pdf
    • https://static1.squarespace.com/static/5fc580a188c99b6d37c677f9/t/5fcafbc30814be4f73e10972/1607138245203/97016263847.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe080af3de5e49b52b2d3b/1606289419404/nhac.vui.vn_ng_ca.pdf
    • https://uploads.strikinglycdn.com/files/d05043b3-c0ab-4776-b8ca-e5294f308d5e/wahl_model_9918c_manual.pdf
    • https://static1.squarespace.com/static/5fc692bfa13a450bab1bb5ce/t/5fcb4026a51c5a1401a6ddbd/1607155751128/mudujofosekabax.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4c7da97599144eedaed7/1606372478745/84710550244.pdf
    • https://static1.squarespace.com/static/5fc5d8fe403f5353fdb77b13/t/5fd0dcf51c49363a9b55ce49/1607523579648/48198032509.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dc34.bin
3b71c3779e5ee0b59e906bc012c84656ec0e386f98cb3d5891d0a1b0cf65ef42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC34 6164 bytes
font_01_sfnt_off0001f149.bin
e2756793e73e29a2b943490f7d98fcc535575bae3da5d360f8a60537d6b0d466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F149 11624 bytes
font_02_sfnt_off000218b2.bin
cae38d9da3505f9ca430778d2af89aba0e188975e211645032e0167081cd4c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x218B2 16192 bytes

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