Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b333057761f05b1…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 18:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c998a1fc5739033cedd9dc175c3a5ae SHA-1: 21652b61a0f72a64a6e00beb6acd3062511e195f SHA-256: 2b333057761f05b1ab6907c1367032e24b88a67d72e78ffee9432ecb48b0296f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classification strongly suggests malicious intent. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/strik?utm_term=gone+with+the+wind+movie+plot+summary PDF link annotation
    • http://toluvubub.mygamesonline.org/deforestation_effects_on_environment.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/jjbhagi/vatisomejafivodokebuferot.pdfIn PDF document text
    • http://detonic-buy.website/mikelinozikujimo4zcjc.pdfIn PDF document text
    • https://toxodapakaxoza.weebly.com/uploads/1/3/4/5/134525452/583233.pdfIn PDF document text
    • https://lozorodarefela.weebly.com/uploads/1/3/2/6/132681783/3299703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468819/normal_6019791fd17f1.pdfIn PDF document text
    • https://vepovadubit.weebly.com/uploads/1/3/2/6/132696500/bulenekibokepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5fd279d71ba57.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/jfigjid/free_slot_car_racing_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5feb8afaaf846.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/icT6hc8/62185456273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_601b82d1bcd6b.pdfIn PDF document text
    • http://wisecreditscore.info/fifty_shades_of_grey_summary_by_chapter7keqx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/822d212e-8b54-48ad-b0a7-73bf073d381b/daru_band_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ba4035-51fd-46a8-aebc-65804b6c53c9/how_to_pass_a_test_for_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3badfc7e-298a-47d2-9dee-3560728a72d4/gatebulupadebapoduvebinog.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/45710380799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753b2bac-7597-4bd2-b661-379e594d7785/what_lancing_device_works_with_freestyle_lancets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30606e3c-4a9a-4a60-850f-56952df6e6ee/carreras_para_estudiar_en_la_universidad_nacional.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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 5484 bytes
SHA-256: 1522edf2cb65991918a1af150d967fb5309e9241048e4db3b3436fb4fba2c91d
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10804 bytes
SHA-256: 8758a8a515b2d0c8cd4354d8fe15a855762d0f60031ef787446891eb14f208da