Malicious PDF — malware analysis report

Static analysis result for SHA-256 32781f8435ba52fa…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 17:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 579b8c7fac6f508f5b08262ff6b45e60 SHA-1: 612f6061359ecb140d1e1ed07903fe802d10c939 SHA-256: 32781f8435ba52fa397fc85bc3f3b2aeec72692eadfce3fcc068cb10e1db2d94
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/123?utm_term=baldi%2527+s+basics+mod++easy PDF link annotation
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/3245400.pdfIn PDF document text
    • http://poopo.ru/fuzizafusiwaleseiury3.pdfIn PDF document text
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/8295627.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/jepUJhd/74536037036.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/Bh6ELja/offer_to_lease_commercial_property_template.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/lususajifapa.pdfIn PDF document text
    • http://istlan.fun/kick_the_buddy_free_download_pc0evcj.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/nKgfVhe/3052073585.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/ajhgKkc/6637547687.pdfIn PDF document text
    • http://ideal-it.fun/download_audacity_pro_for_androidhn4bn.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/7ijyha8/open_office_free_polska_wersja.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/9ifnhdr/online_senet_odeme.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/iaqcNk8/90863158088.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/xiavheN/70362776535.pdfIn PDF document text
    • https://sawawinuta.weebly.com/uploads/1/3/1/6/131606003/nixelazi.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/c8f28fd6-ede1-4617-a38e-984199cbd3da/31841094046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcd5c1a-aee6-423c-be27-ce177adf2278/how_to_get_your_football_team_sponsored_by_nike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7d5273-69c1-4a86-9ecb-44a5b70bcda7/bufugutamakipesagapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd04362-28a5-4dc4-8781-bb0d874795ff/the_hitchhikers_guide_to_the_galaxy_summary_chapter_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf0817b-97d1-4492-b476-6e1c17ad6a09/is_it_dangerous_if_your_pet_dog_bites_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ccb1cad-c4d2-43b3-b590-82ceee44ce03/goflex_home_software_iso_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78c3b1d-434e-4da1-a683-8b6f39ba1ddb/xutitufizutakuxug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8fb4c0d-8d96-422f-a916-280945555f21/hodgdon_lil_gun_300_blackout_load_data.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_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 5312 bytes
SHA-256: 1d96abe82a772c3480cfc2ebd3d61c2c7729c749967e7b22188ba2efba88498e
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 10840 bytes
SHA-256: f01378cf7b180e6bf0cf16d4b1c2f2f85d4406f72a2bdc2883ef7dcd8a977313