Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f87137442a72d24…

MALICIOUS

PDF

81.9 KB Created: 2021-03-07 08:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8cac894d51ddca31e3e1dbeb0ef8b2cd SHA-1: 0efcaeb46270938a633cc3f747364b57bec66db8 SHA-256: 8f87137442a72d2466d44713a1ecd69d65038c17f6c995d33d7c4868b20abb8d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or spamming campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=garmin+gpsmap+64st+best+price PDF link annotation
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/5719066.pdfIn PDF document text
    • http://bestita.space/tufuforelil130z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5fdf4560e28f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fe2b6c5d0541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_602eaa4231705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_601000de7ace0.pdfIn PDF document text
    • http://monongzhlh.space/rilamorimoriewwh4.pdfIn PDF document text
    • https://vedirivokezijil.weebly.com/uploads/1/3/4/1/134108565/mumowuvolemis.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/c3c3af35d6baa.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/5484596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_603f1c9b9b6b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_b6f7048d38d5465383f1af57f8d944ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/037ca0b4-d927-4f28-91ee-42bb55b31bcc/book_review_template_for_high_school_students.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/courts_singapore_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/will_there_be_a_season_2_of_demon_slayer_after_the_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a223f77-60d4-4163-9c38-796c7171d4b0/halo_books_release_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ad7573-c2b9-4be9-9d5d-bdd204ed75c7/calculate_volume_of_right_triangular_prism.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/nortel_m3904_expansion_module_programming.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_e416707237704e849bb4578f32b300ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31cac4a4-10e0-4018-83cf-8b95e3829a77/rt-ac68u_merlin_factory_reset.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_bb5fe62d4a4549cdbf800feee45a0fdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupuxus/ps_photoshop_background_hd.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_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 5636 bytes
SHA-256: ae25a9842a4e6de6e032206eee3b680de0e41ff3c5c1a25c742f401cd96b69c9
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11188 bytes
SHA-256: 2e51a1249fb3ada3449798282a5a070ede447db6d32e5da085208e968ed670fd

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