Malicious PDF — malware analysis report

Static analysis result for SHA-256 b438660bec18400f…

MALICIOUS

PDF

73.7 KB Created: 2021-02-20 11:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 16fe16fa844111200e370dfd1cdb82a3 SHA-1: 2d685c3a8daa4f1352de4a037872af8479d04892 SHA-256: b438660bec18400f640612519ce7446736eeb103479429af1829f41a87637ac3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

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://jacksth.ru/strik?utm_term=human+sexuality+diversity+in+contemporary+america+9th+edition+pdf PDF link annotation
    • http://grusha.space/section_5_firearms_act_1968_sentencing_guidelinescua7f.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/hfJjaia/green_pepper_soup_with_hamburger.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/Eif9Cgf/nelig.pdfIn PDF document text
    • http://itayoga.space/10._3_acquiring_new_lands_worksheet_answers9v084.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/vUTEhjj/hair_salon_games_monster_high.pdfIn PDF document text
    • http://lifeit.pro/plantilla_con_margenes_para_escribirtqwhr.pdfIn PDF document text
    • http://instahelpforbusiness.com/loligena5moxl.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/igcgjic/34839677810.pdfIn PDF document text
    • http://womenita.fun/jabobezulidunoxnqec.pdfIn PDF document text
    • http://tivirazetuxozux.22web.org/98555184319.pdfIn PDF document text
    • https://cdn.sqhk.co/jamasedese/d9v5aPm/worlds_hardest_game_unblocked_3.pdfIn PDF document text
    • http://viewcreditscore.info/459886942324uh52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/44300339624.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/sebomub.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/rakuten_marketing_consent_management_platform.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 5744 bytes
SHA-256: ac92a622d6ea20206cbf73748cb4c3ee9b80267f80546ff87cbb0665b2b367e9
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10472 bytes
SHA-256: 076ba5328345a13219ec143e327568e5a50c8cbf019f1cbda7f12914b409fde8

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