Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e44fbc7e33e9dc2…

MALICIOUS

PDF

77.0 KB Created: 2021-03-01 07:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cc87e77a38920b9da5422001a0a209cc SHA-1: c0a9b17f6a95c03f271fd97b978e933d331bde63 SHA-256: 7e44fbc7e33e9dc22f5f7f958d83e30be435e5ec7d38b9cce5b01f5d3f26295d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+to+use+omron+electrotherapy PDF link annotation
    • https://cdn.sqhk.co/lewiwifo/Rgchbif/1057421596.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/jdihXOW/73868390276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458616/normal_5ffd371534d54.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/welotafogogulam.pdfIn PDF document text
    • http://folejaf.mypressonline.com/when_it_changed_joanna_russ_questions.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/asma_bronquial_tratamiento.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/dygevpa/download_lost_miner_premium_apk.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/ruger_air_hawk_elite_ii_.177_pellet_air_rifle.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/ehioOp8/bifurasikurigopajusupu.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/dnd_5e_warlock_expanded_spell_list.pdfIn PDF document text
    • https://cdn.sqhk.co/nakolore/K3gejgt/how_to_unlock_a_sim_network_locked_phone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutenujute.myartsonline.com/one_of_us_is_lying_tv_show_release_date.pdfIn PDF document text
    • http://zexizel.epizy.com/rimelusarubone.pdfIn PDF document text
    • http://mifevup.rf.gd/merchant_of_venice_text_with_paraphrase_xavier_pinto.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/jump_force_next_dlc_characters.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/physics_principles_and_problems_study_guide_answers_chapter_4.pdfIn PDF document text
    • http://semevalidenod.rf.gd/crossfire_miniature_rules.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/36901747557.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 5328 bytes
SHA-256: c65d2c43acdf4483eb0e3af0c292a239832c6a113ecec53bdf0092cc5883f0de
font_01_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10620 bytes
SHA-256: 3801f304c33570fefa005381a965a046161d6b3dd71df68be1f1ebeadbe5b7c6

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