Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff66ced593d5db6…

MALICIOUS

PDF

86.0 KB Created: 2021-04-02 18:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11e2bd84dde21dbdb7f9cd82b5dd6b51 SHA-1: 998ddc76f244f6f69e63d5602b6b67b18716eaef SHA-256: 9ff66ced593d5db6937234f7f6e7b4fffd591c2daa74f3af18cff1a1858b3b3f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly suggests the document's content is designed to trick users into believing they are involved in a lottery or parcel delivery, a common advance-fee fraud scheme. The presence of numerous external links, including one to 'zajinet.ru', further supports the malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=epson+artisan+1430+inkjet+printer+price+in+india
    • https://cdn-cms.f-static.net/uploads/4449604/normal_6024039ad3a67.pdf
    • https://bafalado.weebly.com/uploads/1/3/4/8/134865771/latiritiwezef_gozupepu_sobopoluni_nawonidudurefe.pdf
    • http://kafujaguvo.mygamesonline.org/how_to_use_phone_as_tv_remote_control.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/1edecc7d.pdf
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/6851231.pdf
    • http://vonexalux.sportsontheweb.net/pipewufujugedarov.pdf
    • https://jugofaxogebu.weebly.com/uploads/1/3/3/9/133997119/pixexobubufokogalade.pdf
    • https://cdn-cms.f-static.net/uploads/4374535/normal_6048c324b1f4d.pdf
    • https://cdn-cms.f-static.net/uploads/4505358/normal_605d0a1f9032d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ec1394a6-46b2-4efb-abf8-4ff0d09fe656/alesis_dm6_module_electronic_drum_kit.pdf
    • https://s3.amazonaws.com/viwoxuz/kuwozijalop.pdf
    • https://uploads.strikinglycdn.com/files/2ac02312-79fc-456c-9266-5fc9acb2602b/lange_qa_psychiatry_11th.pdf
    • https://s3.amazonaws.com/silubebebefuju/sakuforavalobudol.pdf
    • https://uploads.strikinglycdn.com/files/f9321b17-4223-4277-ac22-858ff4a872dd/how_do_you_know_if_your_plantronics_headset_is_charging.pdf
    • https://uploads.strikinglycdn.com/files/cf39afc0-821d-42a7-979f-fff1ecbc8fb9/nobody_knows_my_name_james_baldwin_quotes.pdf
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_a030f2e70bfb4f16afdca2f5b4909e4d.pdf?index=true
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_730fbe3f55c54629948a88d1c581c199.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a737b420-33cd-4bb0-935a-7332d3ff3d3f/mugisegifirufig.pdf
    • https://s3.amazonaws.com/wexukufedepim/formal_email_writing_to_manager.pdf
    • https://s3.amazonaws.com/subopukomanaw/12399539738.pdf
    • http://totefopige.atwebpages.com/22060544298.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_off000111ec.bin
1d7621ee29b987e59643162ed4ac511684c5cd80d89e430ac20fc5189b519bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 5580 bytes
font_01_sfnt_off0001250c.bin
594deb62a2b6f463a37b900582a68c23380772a556d7456568ef630305d0f5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 10760 bytes

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