Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4381e695823d2a4…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 14:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1323b214a35cd5efefcee1fd3ab903f0 SHA-1: 757b6deea3800077f2d8637a7cf6124640bf3eb2 SHA-256: e4381e695823d2a415b89366d967b778f8b6eef08e089395b1c4b486d6f75131
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely for SEO manipulation or to distribute malicious content. The presence of multiple external URIs further supports this, with one example being https://pelibifir.ru/123?utm_term=arduino+uno+analog+input+voltage+range. The document body is heavily obfuscated and unreadable, but the overall structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?utm_term=arduino+uno+analog+input+voltage+range
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/xasezaleluxelo.pdf
    • http://magnetfix.store/mogozufesibazinawidad65dui.pdf
    • http://komaxinatobofe.medianewsonline.com/fibowaj.pdf
    • http://nusowutevu.getenjoyment.net/theatre_the_lively_art_10th_edition.pdf
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/sufeviwesode.pdf
    • https://cdn-cms.f-static.net/uploads/4453105/normal_600fd22bf3d21.pdf
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/4009104.pdf
    • http://fofiwafajelerax.sportsontheweb.net/chicago_electric_tile_saw_46225_parts.pdf
    • https://vatikaleme.weebly.com/uploads/1/3/5/3/135386674/xavobi.pdf
    • https://cdn-cms.f-static.net/uploads/4446165/normal_600bb4096d7f9.pdf
    • http://getyourcredit.info/how_to_repair_a_leaky_single_handle_faucetraceq.pdf
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/tegapotamuwodepuw.pdf
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/zinevewozoripe_nezazepagu_piwodo_josikususeximeg.pdf
    • https://cdn.sqhk.co/zejegure/jeChhjA/flat_army_2d_shooter_apk.pdf
    • http://4338bacchus.com/mekorulodakawopexikesin2b96x.pdf
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/6bc81c206.pdf
    • https://cdn.sqhk.co/gituridewo/Y6BWWuw/island_in_the_sun_park_clearwater_florida.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e33a.bin
9baa8a040885b24c3cfbdfc039c1c64dd9a399feba4f8162f1c737a84947d0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 4996 bytes
font_01_sfnt_off0000f452.bin
e9dd6851f635806a41e8087b3d7b851ce37d80df9cd16e9ff16e16d127c8ef45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10788 bytes

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