Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e9491306adf6a9…

MALICIOUS

PDF

106.6 KB Created: 2021-06-01 08:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ba50cf37c347b1823b848b748a83e39 SHA-1: 201eea9892c68b6f6dd2289da0ed4dabb58d0ca1 SHA-256: f6e9491306adf6a95c8e8f574f626c92a7f054840d60a23e0c5807f9aeb72e37
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily corrupted, contains text related to downloading Excel templates, which is likely a lure to disguise the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/pbw?utm_term=warehouse+kpi+dashboard+excel+template+free+download
    • https://sofotegepure.weebly.com/uploads/1/3/4/5/134522016/nimafepegezigobuxe.pdf
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/9235a16.pdf
    • https://xaxunuvupewiro.weebly.com/uploads/1/3/3/9/133997201/a67f922fc.pdf
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/94e1e22272.pdf
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/pujijulofifo.pdf
    • https://puzubogo.weebly.com/uploads/1/3/1/0/131070381/tivojomabufu.pdf
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/62330.pdf
    • https://vadidavulegisiw.weebly.com/uploads/1/3/4/7/134760242/xizit-sopaxazero-nuvor-lofedakefifa.pdf
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/fugafuxekim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ee4efa2-ad9b-406a-ac1e-b58b6a31064b/gomakerobofuw.pdf
    • https://uploads.strikinglycdn.com/files/46ebf20b-08be-44af-a5ee-7e0628b49635/50299078562.pdf
    • https://uploads.strikinglycdn.com/files/892a8f6c-57bf-49c0-92a0-79c2cf5eaf32/distinguish_between_accuracy_and_precision_in_measurement.pdf
    • http://wamotarirup.pbworks.com/f/duzogusidi.pdf
    • https://uploads.strikinglycdn.com/files/38d65f91-5072-4da8-ae14-50e6c71213b2/lejidijetox.pdf
    • http://midevodimu.pbworks.com/w/file/fetch/144448305/rosojutexitaroti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015301.bin
94fe8299d0118ec8b837896914ff9a9affcf2b096fc5337d92cc183b61636e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15301 5772 bytes
font_01_sfnt_off0001668d.bin
fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1668D 2140 bytes
font_02_sfnt_off00017067.bin
bde92eaad0897184c91bd44075b378db40a182fc61d97210caa9e375214e9499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17067 12748 bytes

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