Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf19d9af72abaedf…

MALICIOUS

PDF

72.7 KB Created: 2021-05-22 15:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a88afc355289997f6112e20d8905597 SHA-1: 738c0fc49fb16dd81d6b0710ab0970a3769b60c7 SHA-256: bf19d9af72abaedfcf0a39eebc8773c60faf660635b61878838b9e94a97c0fa1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to 'mezovuduw.ru', suggesting a phishing or malware distribution attempt. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/strik?utm_term=immunization+schedule+in+nigeria+2020+pdf
    • https://cdn-cms.f-static.net/uploads/4464870/normal_603a7e74399c1.pdf
    • https://vanixegufewip.weebly.com/uploads/1/3/4/5/134511125/99134a7.pdf
    • https://cdn-cms.f-static.net/uploads/4403540/normal_601b936cf0b1d.pdf
    • https://cdn-cms.f-static.net/uploads/4449399/normal_600d7b46168ff.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/fikisakedisu.pdf
    • https://todusoxi.weebly.com/uploads/1/3/3/9/133999566/528e3d8.pdf
    • https://cdn-cms.f-static.net/uploads/4383475/normal_6061fdb4e08d8.pdf
    • https://cdn-cms.f-static.net/uploads/4477921/normal_606a13b64f394.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fe7dddd16b7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/redegelesibif/40082385806.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/torir.pdf
    • https://s3.amazonaws.com/kagedatabujo/american_journey_oven_baked_dog_treats_recall.pdf
    • https://s3.amazonaws.com/limepusotanal/revaje.pdf
    • https://s3.amazonaws.com/ninazarila/you_are_the_reason_piano_sheet.pdf
    • https://s3.amazonaws.com/xoferuzu/dawumikowenibojoduleke.pdf
    • https://s3.amazonaws.com/wisuw/tewenivosunemomop.pdf
    • https://s3.amazonaws.com/tevomenil/wawekukonimipi.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_off0000dcb8.bin
6339611c6b874051754c6f7b406c1d00e19f35ae8797c3331976127238472960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 5832 bytes
font_01_sfnt_off0000f06b.bin
8401664d126b2563b34c0c731e75d44163cb66f43a827e6e672a0c29bf14d15d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 10360 bytes

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