Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9cd8786590f859…

MALICIOUS

PDF

71.4 KB Created: 2020-11-24 20:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d881dc12a13e6e39d606f06b3752fae1 SHA-1: 7ab68d8cfda80331451b3df8c36a1e7db8017c8d SHA-256: 7a9cd8786590f8596555f9b303ec370d58d4d3977c850ae07085f19e5d6c4d60
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('trafftec.ru') that is likely used for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to drive traffic 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://trafftec.ru/strik?utm_term=national+association+of+pastoral+musicians+convention PDF link annotation
    • https://jigulukeduza.weebly.com/uploads/1/3/4/5/134508725/9053b3188f.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/jutenojamega/pidatozosotasogiwiregamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a48491-e4e4-4df1-9347-e09861dcce69/ted_talk_30_day_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fd5eb8-5de2-492e-a036-4302bb790964/54708400094.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/blackberry_bold_9700_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b73f7f-42ab-45d8-90c3-d2adb6a6b0f5/multiplication_table_1_200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f8a626-4b7e-4abd-bdd5-4666c0897ed1/fuvopox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa9a605-38bc-4952-ba46-dcbd521fd071/vespa_et2_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7c6600-924f-413a-8b3d-961ea7d838b7/jedi_robe_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e90a00-f029-431a-8a7c-5a72b03b2712/89485028785.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/31524691189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799d4f0f-62ee-461c-b844-b2a1acac4b30/bogijasidujuxasezugaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 5188 bytes
SHA-256: 36b8a5ddbf61f0d04fe95430fbea1eb4d72b2acd544b5bdca925b8ecc88e8ee4
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 11332 bytes
SHA-256: c4f930631fe90d7b05cdfb1a01a75b08f78e78b54c954fbd61c797b0e0862e3c

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