Malicious PDF — malware analysis report

Static analysis result for SHA-256 be95dcd653ce4ee9…

MALICIOUS

PDF

78.0 KB Created: 2021-03-30 17:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4cf0999b5ed47f381e6b98876a33110 SHA-1: 4a93684980e0f426ac9f4594feac704679d344f3 SHA-256: be95dcd653ce4ee9361c62a5be4334f9e6e98111d3d578f97eab6728adda1ead
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 SEO-optimized and point to other PDF files, suggesting a link farm or redirection mechanism. The primary external URI, 'https://maypoin.ru/award?keyword=classification+of+matter+worksheet+pdf+answers', is likely a lure to a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=classification+of+matter+worksheet+pdf+answers
    • https://cdn-cms.f-static.net/uploads/4443371/normal_6026d18996412.pdf
    • https://static.s123-cdn-static.com/uploads/4459162/normal_5ff9c13ab725e.pdf
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5fd7730d62385.pdf
    • http://medebupima.sportsontheweb.net/2019_sv650_service_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4392439/normal_6057014171b4e.pdf
    • https://static.s123-cdn-static.com/uploads/4412403/normal_600534dd9a107.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_248131ffa29543d7a657b938a88fa707.pdf?index=true
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_bbb3b339666e4ab082c9d36f0f3173e6.pdf?index=true
    • https://s3.amazonaws.com/padadutiseni/campbell_biology_10th_edition_online.pdf
    • http://rawigukegopafot.onlinewebshop.net/83354119812.pdf
    • https://s3.amazonaws.com/kefefetafij/demons_dostoevsky_page_count.pdf
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_f47228b12c6e4d8f821defba676186b4.pdf?index=true
    • https://s3.amazonaws.com/kozewuposoridil/nina_godbole_cyber_security.pdf
    • https://s3.amazonaws.com/sugosubexez/xirevitatubizavefefiniza.pdf
    • https://s3.amazonaws.com/wetevali/15377995608.pdf
    • https://s3.amazonaws.com/luxaduzimase/pinitejanetosadax.pdf
    • https://s3.amazonaws.com/povodijirig/punovabomobewodubigito.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/steelhead_fishing_report_deschutes_river.pdf
    • https://s3.amazonaws.com/wolina/hp_pavilion_dv6_reset_bios_password.pdf
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_c2708be69f864a01a9747a43a2874b78.pdf?index=true
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_0da9cdf2a5144e0a9b4ab7489549b04d.pdf?index=true
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_31a174513b3c46ca8479f6f554298626.pdf?index=true
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_618298a9c4254dc8934f6092189f1fe8.pdf?index=true
    • https://s3.amazonaws.com/fowikorejodi/backus_naur_form_grammar.pdf
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_bb2f54ce0f7046838e6ecf9ddeea470b.pdf?index=true
    • 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_off0000f1d3.bin
4684c33bbd80113f373652dbe9b926c396538eb511d28a5db1b7bb590aabe14f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 5456 bytes
font_01_sfnt_off00010443.bin
d454ee889964b6ac64cb03580c61482c3db79524e8e800f7e0de65e23f20ec59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 11156 bytes

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