Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a71c6af17fd7f6…

MALICIOUS

PDF

80.5 KB Created: 2021-02-28 17:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83a399f9b0603cdddb50d175166ea742 SHA-1: 5adac8395e8dd2a76315b2dfac190e910254be9d SHA-256: a7a71c6af17fd7f6a6be2ac8e867a98e364e9a52f24257af9b65dbe4b2d72e58
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a tactic to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=can+i+use+ps3+controller+on+firestick PDF link annotation
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/9cd48c7abc5.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/NIicajs/philippine_stock_exchange_game_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/gcgh0rN/19157831146.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/fxht2w2/boxofoka.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/Ugeijhg/flower_zombie_war_hack_download.pdfIn PDF document text
    • http://xazirinid.iblogger.org/what_is_a_diversity_candidate_on_monster.pdfIn PDF document text
    • https://cdn.sqhk.co/suxunuke/jdCBSsw/there_s_a_butcher_around_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/lojavowi/Bhghi7W/91094324432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_60225248c99e0.pdfIn PDF document text
    • https://malufatagu.weebly.com/uploads/1/3/0/8/130874424/tufenixoxemo-kesekugiziluben-tagogo.pdfIn PDF document text
    • https://rakatifuz.weebly.com/uploads/1/3/5/9/135964199/napigexatel_desunetut_moforer.pdfIn PDF document text
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/lanulisijupafa_nikuroxozolof_wuder.pdfIn PDF document text
    • https://ferijivoko.weebly.com/uploads/1/3/5/3/135327637/gegitutive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zobemodorujo.rf.gd/methane_carbon_dioxide_reforming.pdfIn PDF document text
    • http://siwavubixuvavil.rf.gd/mapping_the_rock_cycle_worksheet_answers.pdfIn PDF document text
    • http://kanisal.epizy.com/who_diarrhea_treatment_guidelines_2014.pdfIn PDF document text
    • http://soxupagab.epizy.com/zebavidiluni.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_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 5144 bytes
SHA-256: a43e4bf783693cefaf408938417e28bf9941c50c1a4d88913021445a13e95a98
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 11632 bytes
SHA-256: 408a1e2703fe183f245ffe315425c0c92e5a0a7f1825ffe6b5e327d8827950ab

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