Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f2ada0513134c…

MALICIOUS

PDF

84.8 KB Created: 2020-11-23 01:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1ca3bf9ab0fa153463b69851a96f6758 SHA-1: 5a3814682b1768d054b06b3fad653cf7d06df40e SHA-256: bf9f2ada0513134cd383f3cfb34831dda02744ea9f3c85e47cb3c156b8d017ce
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://trafffi.ru/123?utm_term=shingeki+no+bahamut+virgin+soul+nina+episode+1 PDF link annotation
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/198981.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/jovifigote_vijal_xomen_sazibujokol.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/bbd21836-a3a1-4628-b551-e228a0af1fbc/pakoguzijelob.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/letter_of_consent_secretary_of_state.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d817fc57-cfcc-4149-8265-94029e94ceba/jenn_aire_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/international_trade_and_balance_of_payments.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/architectural_lighting_and_acoustics.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/high_sierra_shower_head_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/55772475715.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_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 4612 bytes
SHA-256: aa4f564f0b2c526c6ffe59c450372d90948bb430295e61dd6319c546aa371af4
font_01_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 5792 bytes
SHA-256: 50f12e8e7ff34e2263c4c3a899442ffc4940dfa9994cfe909a6f47b70fedd8e0
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 10024 bytes
SHA-256: bbc3655726504492b30a47936ac86d65fd2582f03a59c3bbc606ec58b1444cb4