Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fbc143985181ec…

MALICIOUS

PDF

81.2 KB Created: 2021-03-21 00:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4b5398d8db20a2dff562a7e2d60acb95 SHA-1: 8b1712572a39253a0e4df4184cf2bb84af2df676 SHA-256: 35fbc143985181ece24136a23be658dc5dc1101d340f7923d4875f8be756658a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain. Heuristics indicate the PDF acts as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

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://pelibifir.ru/award?keyword=citas+bibliograficas+normas+apa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6018ef441da4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_60235ab527b87.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/nadokulud-wuvutuni-bubenujug.pdfIn PDF document text
    • http://prizinsta24.space/armenian_music_free0w3xp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6021ea4b12645.pdfIn PDF document text
    • https://susesape.weebly.com/uploads/1/3/4/7/134734791/refufubu.pdfIn PDF document text
    • http://closemaze.com/26208705640amzqp.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/9559328.pdfIn PDF document text
    • http://teksalle.xyz/bunimuzebujapenamyyhbk.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/jipidux.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/8307184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_6f3f3ff0123c4997aa6c28f73b0289ea.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_19d55951e0264848bb664834da45684b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/video_helper_alternative_firefox.pdfIn PDF document text
    • http://rupiroliwon.epizy.com/80818917387.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/sugunopob.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_b9623e29b9e8411e902f3bf40847c0be.pdf?index=trueIn PDF document text
    • http://geralumumavol.rf.gd/76208239588.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_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 5520 bytes
SHA-256: a009a615bfa307fb727d8bd8d4226314882d7a79ef8ca21946a18a6efa868416
font_01_sfnt_off00010dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 12204 bytes
SHA-256: 121ab2dae660db2990412bbcb026061fbfc31d1e22cea93a4411a91cd4bcdf52

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