Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a517aa36202ef4a…

MALICIOUS

PDF

76.0 KB Created: 2020-11-24 12:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d391dba3449c7f68c318f28b73f495f SHA-1: 1c1d987ead0ebdf4a0a6be9dc37d9f70236bff3e SHA-256: 6a517aa36202ef4a8a41a7f6ee01f4081e61166fa47f66614e2d45aad74472b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to link farms and potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further supports its malicious nature. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely as part of a broader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafficel.ru/strik?utm_term=wow+wod+gold+guide
    • https://bufemiwod.weebly.com/uploads/1/3/4/8/134846302/zelomaru-migibot-sosasal-donasow.pdf
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/9e3bbaa9a203a.pdf
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/65bf3.pdf
    • https://bulireta.weebly.com/uploads/1/3/4/7/134727307/8752124.pdf
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5f8a4ddba9289.pdf
    • https://dilabugesoko.weebly.com/uploads/1/3/4/6/134627797/f2477.pdf
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f919fcb2d0a1.pdf
    • https://gidexexururetus.weebly.com/uploads/1/3/4/5/134505918/zenomedosuzome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ee8352ae-f3b0-4f6c-aab7-ed2f4ce0fb5a/7404237232.pdf
    • https://uploads.strikinglycdn.com/files/01d68cf3-3426-4fcf-9c90-016f431b6c9a/postnuptial_agreement_infidelity.pdf
    • https://uploads.strikinglycdn.com/files/c8ab1c1c-57e1-42df-973d-bcdad2e06af2/tipos_de_fracciones_homogeneas_heterogeneas.pdf
    • https://uploads.strikinglycdn.com/files/c863f124-1148-46c8-9998-34ea367de32e/long_run_supply_curve_perfect_competition.pdf
    • https://uploads.strikinglycdn.com/files/67d0460f-5a4e-48e4-beb6-172e6d0d129f/rasujamobukopef.pdf
    • https://uploads.strikinglycdn.com/files/f715ba63-7b13-4d19-8572-48bda7d8757c/42518360031.pdf
    • https://uploads.strikinglycdn.com/files/944d9a2f-7c18-4711-a185-868f3e526465/v_number_5.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_off0000ed94.bin
21432c38e1e858848594ee8858aa92384d513936900ba9047ed95719fb32eb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 4616 bytes
font_01_sfnt_off0000fd76.bin
a49f6bcdefba40367c15ef8f55962c2ef28e6e214c3748faf242e4d0777e48bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 10956 bytes

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