Malicious PDF — malware analysis report

Static analysis result for SHA-256 34af6173b8c90c57…

MALICIOUS

PDF

73.2 KB Created: 2021-01-04 00:23:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 53700ff503af3e413789dccc42e10827 SHA-1: a7557700795424fc46e495e52552fe6e76f11a75 SHA-256: 34af6173b8c90c572d4c3398d501fa2aeefc1eeb3ddc1efbcd0c1f6f4087b3c2
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent link directing users to 'trafffe.ru' under the guise of downloading SQL Server 2016 Express. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffe.ru/aws?utm_term=sql+server+2016+express+developer+edition PDF link annotation
    • https://rodironamo.weebly.com/uploads/1/3/5/3/135347674/87d117e4e.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/bebosugetediso.pdfIn PDF document text
    • https://cdn.sqhk.co/jilijibimi/bigBFya/wosokolexotek.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/bMgigU1/34761153879.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/a27ee3459a.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/fewifuwu/10894396700.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/cafe_max_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/best_desktop_computers_2020_for_home.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/lulakesubojorifudoroniv.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/kirman_lake_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/4611590691.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 5580 bytes
SHA-256: 077fd4d0eb1f8979e9118e2b3cf297f26eebdfd9f00636d928d5501230da88ff
font_01_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 14252 bytes
SHA-256: 707985096ce7ce2ea36ba45860eb4ab29728a892a8f27b8a4f4095e05774da9b

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