Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bdeffae1acc5fb…

MALICIOUS

PDF

74.1 KB Created: 2020-11-25 20:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e81e16399f67a1fb015fd541f6756f11 SHA-1: 73bd5026f43f4b707c4d663ba9cc47cb51d573c6 SHA-256: 51bdeffae1acc5fb65f3e6f29d9d23d6356f4f72bd039a41034d7238b2ad5316
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Virginia license plate'. The presence of multiple PDF links to external sites, including those hosted on Weebly, indicates a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

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
  • 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.
  • 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.
  • 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://traffking.ru/strik?utm_term=virginia+license+plate In PDF document text
    • https://nategenuniko.weebly.com/uploads/1/3/4/7/134749174/jediginikuz_dinigazebim.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/0ee5489b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fbbccb1a1eb6.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/18dff49.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/limadizade.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/badaneriwepezem_zadanemukux_lolabe_tubizonavebotib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f9125954c6f2.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/bulozor/27787152632.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/gikuvuvoziduvodupebisabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb3c36e-3bc3-4f83-a8b7-ca74109302ac/93684470382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1f2828-79bc-4481-80c0-aaef4487ea80/vajozalokesu.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/vopazaje.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/9030631803.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/98662576163.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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 5064 bytes
SHA-256: 8e7130aa726556ac52735ee020e410bdf6bbd60660b7d422c82fc474928b789f
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10620 bytes
SHA-256: 10f99211a6c596b0f418f9fa4f47d2f2c006b002400cbff8617a20a627de5957

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