Malicious PDF — malware analysis report

Static analysis result for SHA-256 1891dce52694cef7…

MALICIOUS

PDF

65.9 KB Created: 2020-11-24 09:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f21a26fd7b9ca320f91afcf6b0e0ab1c SHA-1: 79f0be618559594bf2c68af987c485c124ff3be2 SHA-256: 1891dce52694cef7c1a953ac54d7044eae2d7d179418ad6c4ecd8907c6d1e192
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=how+to+design+a+transmission+line+enclosure'. This indicates the document is designed to lure users to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link strongly suggest a phishing or malware distribution attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/123?utm_term=how+to+design+a+transmission+line+enclosure In PDF document text
    • https://kijaxezadu.weebly.com/uploads/1/3/4/5/134590125/fasokugoj-lukebinidipi.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/3046187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_5fae7f85ba9c0.pdfIn PDF document text
    • https://sanivuledaxefe.weebly.com/uploads/1/3/4/2/134234591/1238719.pdfIn PDF document text
    • https://fipugodegiposal.weebly.com/uploads/1/3/4/6/134687615/bagoropuvopuxifavex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5fad7ea1f0bc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/1493007682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4131716c-4dcf-4feb-abf1-649e061fd9d6/bavinewabewatuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a3c50c-7ce0-4695-b851-3b5412d68364/43368182829.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/como_se_forma_un_enlace_glucosidico.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/manual_de_calidad_iso_17025.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/72785647457.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/spotify_windows_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/32662279457.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 5312 bytes
SHA-256: 9a9b6c49a7527f0116652702c127f957f9480a43e53eeb87da984ac398fdb33d
font_01_sfnt_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 10308 bytes
SHA-256: 677fd8897ea30cc665330937cc5359c400b9e104d51e4a42959f11946d9f901a

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