Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c77da1cb2f8455…

MALICIOUS

PDF

86.0 KB Created: 2021-03-29 07:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db8aba0df929838c2724210764ba1b09 SHA-1: d0ad5d2a9e43cfdfc0cf1e44e82fdd3931605b33 SHA-256: a0c77da1cb2f84557c082e6eaca8ba9502b30a4f8fa733b2471742738eed36b6
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, appears to be a lure related to product specifications, aiming to trick users into visiting malicious links. The presence of multiple external links and the overall structure suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=cricut+crv001+specs
    • http://chambreapp.xyz/83924232849rx9bh.pdf
    • http://helper-badges.com/2007_ford_e350_van_owners_manualrrwwl.pdf
    • http://canonsburglake.org/81177338654zyr9p.pdf
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5fee684fd0c61.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_603ff7314202d.pdf
    • http://yognat.space/shield_charge_buildz4hik.pdf
    • http://wovoradomumakil.medianewsonline.com/cambridge_english_language_assessment_test.pdf
    • http://ribadubeko.scienceontheweb.net/brachial_plexus_injury_classification.pdf
    • http://tadosuzewamu.medianewsonline.com/cambridge_5_listening_test_2_answers.pdf
    • http://pusovemolexed.scienceontheweb.net/sixawuvuloxiketonolekoteb.pdf
    • http://tudilaxug.22web.org/79401640070.pdf
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fc71a93a9375.pdf
    • http://copyrightsupporteds.com/fukutarevalulenula1vilh.pdf
    • https://cdn-cms.f-static.net/uploads/4450631/normal_602493ab8eea0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gunexukod.epizy.com/zukob.pdf
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_5853c9f852b74b989e219a18808e853d.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_0dc1af0d554149e6a2ec37b037e719b2.pdf?index=true
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_b37a48fac1584658ab0ef56388bcec3b.pdf?index=true
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_8b41469dd59646a983ac553156fa7066.pdf?index=true
    • http://lixumogal.epizy.com/conic_section_worksheet_with_answers.pdf
    • http://xufoziminep.onlinewebshop.net/princeton_review_cracking_the_sat.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_off0000ff54.bin
5aa98a1ca47d28e05717b4ef7cb8e59c84c21d7fd37f348dbef50c6740e8683f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 4844 bytes
font_01_sfnt_off00010fec.bin
4300edb3b40c106de2ce260890a9a5f0df7139d1ee53a0312133301b0ef81f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 10952 bytes
font_02_sfnt_off00013581.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 16144 bytes

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