Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90ad1f575f71e1e…

MALICIOUS

PDF

77.1 KB Created: 2020-11-29 15:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bfffd8a1cae3ab9de74d529e8c6cf850 SHA-1: ece6800d34e1cc0ce35ebd95eede2f1ec59daa86 SHA-256: a90ad1f575f71e1ec73a799f15334aa42b972a75f30d3a105fc879591d8e6d0b
156 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with one pointing to 'traffset.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or phishing. ClamAV detection and ML classification strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'data migration strategy document sap'. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?utm_term=data+migration+strategy+document+sap PDF link annotation
    • https://debawusajatowi.weebly.com/uploads/1/3/4/7/134707072/c9e5cdf16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5fbf1f7c7eb60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5fc17a9ccdd83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c4ebcb-8e7b-4cbc-8f38-2fc885b18aeb/13144492528.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/letter_asking_for_information_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ae54c1-6e38-4de4-a3ae-25614d30ba8d/nexovuru.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/speech_writing_format_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/controls_for_air_raid_basketball.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/puzosiwexiwezunati.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/81043865129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44d3fa3-b8ed-4c01-aac6-472d42e5e15c/nosumila.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/answers_hq_dog_tag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638ba4b6-952b-4a17-a611-1903ec885b58/80612585662.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/76998579674.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_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 5460 bytes
SHA-256: 7e779f88f2733e9610a1b12e526786d64898e8eddf47be6b41d18a6ec3de362e
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 10856 bytes
SHA-256: 3276809c6e1987227acfd3958ee15f77ef59cee5e673ff1110557129227cf6c3

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