Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f8b6143a6a2626…

MALICIOUS

PDF

78.2 KB Created: 2021-04-23 00:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64f9380e988faedcf5e0f511dbbfde5b SHA-1: 7c77794842005ee1177226ed0a81678d4fcf842f SHA-256: 69f8b6143a6a2626a2e38a1a8146b37c8150d9a40f5381c0962f54d3672cbef3
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains a large number of external links, including one pointing to zajinet.ru, suggesting a phishing or redirection attempt. The document body, though partially corrupted, contains text related to group theory, likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://zajinet.ru/strik?utm_term=why+do+we+study+group+theory+in+mathematics
    • http://xanevejesofag.mygamesonline.org/66267731872.pdf
    • https://cdn.sqhk.co/kujotukil/CUhfhcn/17460194657.pdf
    • http://gejedesoni.getenjoyment.net/christian_names_with_meaning.pdf
    • https://cdn.sqhk.co/xawefigi/MOjbji1/pevagefezuwimibobinux.pdf
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5fceb524434a3.pdf
    • https://cdn.sqhk.co/sipebililofo/jhl6hg9/health_information_science_and_systems_journal_impact_factor.pdf
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/9775490.pdf
    • https://cdn.sqhk.co/vefobinibe/g4w9KSa/arash_broken_angel_song_video.pdf
    • http://risimog.mywebcommunity.org/puzog.pdf
    • https://nanufuso.weebly.com/uploads/1/3/4/4/134443711/zomaxa_katagajulile_xadalibediv_fozibaga.pdf
    • http://farunoraxukiz.getenjoyment.net/rofodunerabufexorolaren.pdf
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/tizesuw.pdf
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ff8dbead0656.pdf
    • https://dasifapuzo.weebly.com/uploads/1/3/1/4/131454731/kabopasilake_muluzabavar_polegamimugegij_bisije.pdf
    • https://molawakipo.weebly.com/uploads/1/3/1/3/131379716/86bfb08493.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_9e44bae8aecc4c6eab5841c990c477ed.pdf?index=true
    • https://s3.amazonaws.com/pezofut/lejikes.pdf
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_d305454d87bb4cbba75868023b819d5f.pdf?index=true
    • https://s3.amazonaws.com/xapota/leigh_through_dovetail_jig_review.pdf
    • https://s3.amazonaws.com/bugutaj/76033786918.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/sample_spreadsheet_for_small_business.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f6.bin
c4f2c1830ed4dba00167446bcad5eeaf3f7c5f8ee806a52ae8297c67b64e3bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 5660 bytes
font_01_sfnt_off0001062e.bin
7b2ccd7c598a42bbc7771eb742aca213b49cf14f77dd6c487d250d62df85d904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10872 bytes

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