Malicious PDF — malware analysis report

Static analysis result for SHA-256 800fcb1221293e74…

MALICIOUS

PDF

74.1 KB Created: 2021-01-22 00:31:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0412af1478c9c759457a12d500e80a06 SHA-1: 19630db72d1f5c407ce03b0147a13b556addf0bd SHA-256: 800fcb1221293e740459ea57325711cc1411a692b3f6f60b0182fe7d4acb94e4
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the use of link farms on disposable hosting, reinforcing the phishing lure.

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://trafficel.ru/123?utm_term=quickly+in+spanish PDF link annotation
    • https://site-1176116.mozfiles.com/files/1176116/ankara_devlet_opera_ve_bale_bilet_sat_s.pdfIn PDF document text
    • https://site-1168192.mozfiles.com/files/1168192/mebinolovama.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/NpRKje1/baltimore_city_md_warrant_search.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/fidjvdd/the_triplets_of_belleville_full_movie_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/DBgeFjj/hepatitis_deaths_per_year_usa.pdfIn PDF document text
    • https://site-1174826.mozfiles.com/files/1174826/care_home_deputy_manager_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dRifau4/88909324139.pdfIn PDF document text
    • https://site-1176791.mozfiles.com/files/1176791/rebubofanej.pdfIn PDF document text
    • https://cdn.sqhk.co/jerizukop/URe3nig/dexujivatabetidobewopi.pdfIn PDF document text
    • https://site-1175553.mozfiles.com/files/1175553/8062244264.pdfIn PDF document text
    • https://site-1208413.mozfiles.com/files/1208413/jojobizibazekexibap.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/makumapikeze/xelibipivefarimas.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/alone_heart_sheet_music.pdfIn PDF document text
    • http://pimudovi.epizy.com/ich_guidelines_in_pharmacovigilance.pdfIn PDF document text
    • http://dusetelonuzaj.epizy.com/catia_v5r20_free_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/cccam_2019_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/luvamuwij.pdfIn PDF document text
    • http://kefixofelapadi.epizy.com/laravel_route_blade_template.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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 5152 bytes
SHA-256: cdcb2fb97aac2fe2659685e344bdd3bc817dd8a04d7bc9cc94555e947d0681c8
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 11412 bytes
SHA-256: ea37134c95d5cdbf94b33e2b851d6612e79a9e7a5ad7697184497a0e8fb12f6f

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