Malicious PDF — malware analysis report

Static analysis result for SHA-256 370ae08960451b86…

MALICIOUS

PDF

83.9 KB Created: 2021-03-09 11:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c5f9176716990f330d308e4dd42220 SHA-1: d1f8fe7ea789beccc7aabf710b008ceb27c63f90 SHA-256: 370ae08960451b8677acdff054dfa859e15f032ea9c1ea011af35d8ab2f3e782
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan variant. It contains a large number of external links, indicating a link farm or redirection mechanism, likely to facilitate phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to direct users to malicious or deceptive external sites.

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://resalured.ru/wix?keyword=craigslist+palm+springs
    • https://cdn-cms.f-static.net/uploads/4411681/normal_6046de0c8ddfc.pdf
    • http://table-wait.com/31368434033yjp0s.pdf
    • https://static.s123-cdn-static.com/uploads/4384461/normal_6005f31dee59e.pdf
    • https://cdn-cms.f-static.net/uploads/4414687/normal_6029de12c1db6.pdf
    • https://cdn-cms.f-static.net/uploads/4386620/normal_60471de9c0b35.pdf
    • https://cdn.sqhk.co/nalawanuxa/YJjagep/bikajati.pdf
    • http://reznitskygallery.com/kitchenaid_small_appliance_repair_service_near_metksab.pdf
    • http://custits.space/brightsign_xt1144_manual4scrp.pdf
    • https://cdn.sqhk.co/zinazejoras/Bgdgdll/is_greatest_hits_radio_app_free.pdf
    • https://cdn-cms.f-static.net/uploads/4428039/normal_600fbb45b6f1c.pdf
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5ff65b9a20d35.pdf
    • https://cdn-cms.f-static.net/uploads/4408324/normal_60113296699eb.pdf
    • https://static.s123-cdn-static.com/uploads/4449602/normal_6007126f6944b.pdf
    • http://reduslimitalia-oficial.site/bootable_pen_drive_format_softwaredaea7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_23c6e5ab44c54ca68ad17fbe8ef5c1d1.pdf?index=true
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_0b559a805ad94b28a01321628e995b55.pdf?index=true
    • https://s3.amazonaws.com/nakuzafol/12128318186.pdf
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_609cb92414c84a26b4d4ce179d6bfaae.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_b0a916ffe6cd445b9cdc0b97e83691d8.pdf?index=true
    • https://s3.amazonaws.com/luxelula/xojoxinavozebazukijemiru.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_off00010b54.bin
2b4495c4ef744980092abeadc13557b396a9963eb9293c290857f2b5769460c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 5044 bytes
font_01_sfnt_off00011c66.bin
e212f4c8aa325d35617ecbd2ff849df96a1ccbb0edfadc1cd1d5712e7edf0b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 11636 bytes

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