Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b533a0715f8e777…

MALICIOUS

PDF

77.9 KB Created: 2021-03-06 10:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 65f0ddd15d3a6f0fee4d2ae848878efc SHA-1: 5a08fa9c405763977a9cd51b04dec0a1c0a4b7ce SHA-256: 7b533a0715f8e777d365db96d2788071409443f64fffc979982ec38d482ad66a
186 Risk Score

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, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Remington 700 receiver screw torque specs' to drive traffic to these external sites. The presence of embedded URLs and the link farm heuristic indicate a likely phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=remington+700+receiver+screw+torque+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416496/normal_60151a0df3e60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_6005d8138affe.pdfIn PDF document text
    • http://revodegasiger.sportsontheweb.net/what_is_sweet_potato_pie_cake.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/zaviboromu-memotirinipefod-tazupevabo-vililetetetuw.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/5646337.pdfIn PDF document text
    • http://mibejar.sportsontheweb.net/farelabiludedot.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/zibilon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_7801cd57add441e2958acf7177a088b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79bf599-7e67-40fd-ae8b-68448a7a6734/maytag_centennial_dryer_heating_element_stays_on.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_014fa3764d614ada85f7b1c930f75ef5.pdf?index=trueIn PDF document text
    • http://rixibedi.onlinewebshop.net/how_to_not_fall_asleep_while_reading_a_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1544a890-beb3-467d-869b-3f9cfe7ad5fa/potopoxufojuworesorabuzan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644b3d0c-be9f-45f2-982f-01b64a429d0c/dell_b2375dnf_scan_to_pc_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f5e3e2-bdf1-4b19-b031-b08267a0b3d2/fundamentals_of_physics_9th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2aba6d-e165-4531-a350-ecbaf512ddfb/75818762027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1dd0c1-ea43-4ee8-862f-e70072207a0b/can_you_make_a_ham_in_a_roaster_oven.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_215265bd05334b3c87967a1e1819a11f.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_0d332baa15ef49bfba609ef3970076ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e146c8f-e75b-475c-bffa-75410daf674e/90378656114.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_5b103cd8925143f0b9dc457c19136bf0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/071514ad-b822-4322-8b82-f346a72ef07e/dyson_v8_animal_cordless_vacuum_cleaner_sale.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_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 5516 bytes
SHA-256: 34566c6bbdc474e16839c83228002e31a61b4e24c65bff328da73315891fc56e
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 11508 bytes
SHA-256: f90b3b9f82e4a655b990eac1bc806a9c0e21191d4be66de7144ee76bef2ef3a6

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