Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9e522ddb96ea54…

MALICIOUS

PDF

65.7 KB Created: 2020-11-13 12:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 738648bd26bb6d7a1ceae3a120fca1d1 SHA-1: 17e14d7391849a2d6214c072a8ff94373b692f34 SHA-256: 9c9e522ddb96ea54e4f37995a953f7a42b99e9030cf4218f3ffa2cd4d8c5775b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by multiple heuristics, including ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URLs, with one specifically identified as a potential phishing or malware distribution point. The PDF structure and embedded content suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=exercicios+sobre+a+independencia+do+haiti+e+america+espanhola+8+ano PDF link annotation
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/09809c.pdfIn PDF document text
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/ca4a1c3dbd58c.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/596950.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/jibikozusimaxamebebi.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/lulelepese/medical_words_starting_with_poly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ef6c75-b473-425c-b746-1b0f2469c975/8775469169.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/xomimizilupejawirugigimet.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/biwiliraxoxamiz.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/zuguroxusexamimadipeveju.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/11557671288.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/21256776249.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/roadkill_cafe_alabama.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/nemufudasisu.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/morning_star_zendo_jersey_city.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_off0000c01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01C 5672 bytes
SHA-256: 873f7a3c5200b1a87518311bd8cc2337dcd4f7e27ed442fccc3972c49dcdab95
font_01_sfnt_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 11040 bytes
SHA-256: b0ad8a70a815a621e646b7ba03f717a2769fc8a770f220a1c7d6f0c425c69b29

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