Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5cba605979fbef…

MALICIOUS

PDF

68.2 KB Created: 2020-11-19 15:12:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0e396b4051c87208298c61764abbaf9b SHA-1: d6f873e41517f9223fa0181fcaa6dc2188c9ac42 SHA-256: 2b5cba605979fbef720e791adf79f8c1d6080bc25b20a7cc6bd7c2c027a511e1
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on file-sharing services. This behavior is indicative of a link farm designed to distribute malicious content or engage in SEO manipulation. The ClamAV detection and ML classifier further support the malicious nature of this file, suggesting it is a phishing or trojan distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=college+ruled+lined+paper+template+landscape PDF link annotation
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/1521532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f88ffb62ea30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5f94e1c3df739.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/mexifogizalog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5fa5a272140e6.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/1239017.pdfIn PDF document text
    • https://bisitewo.weebly.com/uploads/1/3/4/4/134496646/e2761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_5fb54591e40f0.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/6166323.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/felasorarabipis/large_coordinate_plane.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/kidutuwuretibibazukogati.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/full_movie_free_arabian_nights_2000.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/mamalilakelubilafonogab.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_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 5300 bytes
SHA-256: 4cd99597c441306c7bf3c322651f9fedf785c073c1d70d48cc14b0185938fe50
font_01_sfnt_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 10940 bytes
SHA-256: df5c79b8533f41bba368a46ffbd468ab73b251006b4ff72b8eecc68e65727681

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