Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6416b90a771f209…

MALICIOUS

PDF

74.4 KB Created: 2021-03-23 08:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a3c0681792a61ee777fc989fe614d8 SHA-1: 4d4cd2e4b5230b4c59a838ba033f53450b9a0337 SHA-256: a6416b90a771f209f2e4d929105c536d0dd528d05e94bd29693948da1c1a2104
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, including a link farm heuristic, suggesting an attempt to redirect users to potentially malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a phishing or link-distribution attack pattern.

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://vilenefex.ru/strik?utm_term=should+python+files+be+capitalized
    • http://mizizufiku.mywebcommunity.org/96545252982.pdf
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/fefarufodufeb_zefijetifaji.pdf
    • https://cdn-cms.f-static.net/uploads/4417023/normal_601d51fedd31f.pdf
    • http://xapiduxirob.mywebcommunity.org/gimofojupis.pdf
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd662188f8cf.pdf
    • http://jedomagisuw.getenjoyment.net/nozixagifoxivowakamovoku.pdf
    • http://kigadotezolesun.mypressonline.com/jefev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zagubip/saregunipupikezeruvemat.pdf
    • https://s3.amazonaws.com/kabisebax/zozejebipo.pdf
    • https://s3.amazonaws.com/wazotojemov/bilaminar_germ_disc.pdf
    • https://s3.amazonaws.com/zunaporam/53649252972.pdf
    • http://gafodix.myartsonline.com/fukidumiperixezo.pdf
    • https://s3.amazonaws.com/bejeseja/64807754155.pdf
    • https://s3.amazonaws.com/subopukomanaw/guided_path_login.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_off0000e258.bin
bc89b7c8545b6a2e35c1e483495fe24cf8c741e0a2085a0f809cbde5d21e1423		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 5540 bytes
font_01_sfnt_off0000f540.bin
21af61f06bdb8b118f444013d95c9dad5c4600f5f6e184607e15813f1147d906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 11496 bytes

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