Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf2401d948d62b5…

MALICIOUS

PDF

78.1 KB Created: 2021-05-20 17:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b3c198b081d0302adee7078997ccb48 SHA-1: 723957e1ebb70f59bc406b612abcaee8d7f510f9 SHA-256: 5bf2401d948d62b596935669edca77871e83a10508f91ac7ce67e0dccff8a585
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=which+blood+type+is+most+popular PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5fddc266c9e26.pdfIn PDF document text
    • https://rapinawenag.weebly.com/uploads/1/3/0/9/130969945/pejiwanapobadunugoxa.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/370665.pdfIn PDF document text
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/jifatelezuseg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451744/normal_5ff7819fc8d72.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/ritiro.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/e31bad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5fd64464e933e.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/xirixepo/ben_10_alien_force_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/847da526-90d8-4467-b111-952d7fc0fa08/visevubuloravefeb.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/ncis_la_episode_guide_season_10.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/bait_full_movie_2000_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d5edbf-e5c9-4a27-b0da-6fc87f963f15/how_much_does_an_airstream_bambi_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2180d14f-63ee-4536-90f7-f0b2021b41de/incose_systems_engineering_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb5464e-61bc-406e-b00b-3e55e57efb0a/mobekuronalagisisimaluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9884b6e-0712-4714-b087-5a650283342c/new_national_baptist_hymnal_song_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c58ea01-9862-4a5c-a0f5-e94e36c98b53/hp_laserjet_p3015_printer_error_49.ff04.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83cea96-176e-4746-a7f3-cd7bc336124a/ar_15_pistol_stock_pad.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/11463036005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec306bd-08b7-4c7f-9dcb-e17eb78cb7e0/40438424274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10613083-8a9b-4eef-8bb4-5f3b9beda7f0/jepulepejejenel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9381fc-fa52-4e1f-bb03-a24f2677290e/94502432999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f11335-ad43-4430-87b9-03c187694efa/splinter_cell_chaos_theory_ps2_vs_gamecube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a41ca41-e36e-4de5-b3bc-65443f61d6fc/motorola_ham_radios_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04243cd7-20c3-485b-95c2-e28f673efd94/fikabiladazakis.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_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 5568 bytes
SHA-256: 5b0f034a1c0c7d6b440b01a97ba7c78bd22d43695c19d44108c3ad803234544c
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 11640 bytes
SHA-256: 3762c398d52f7c2e22a1f2c4206be97c4c123d8d5f8fc1f77eb2d0b5a2fd39b4

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