Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff191de41a7fd86…

MALICIOUS

PDF

64.5 KB Created: 2020-11-23 22:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2c8ff2fe98832c38541d0894f8c90a6f SHA-1: e6ecd0ccc765ed4a8bae5279bc2c405a1915d432 SHA-256: fff191de41a7fd8658a3388470c39dd1d369f786839c498a5b7f36ebe647a33c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though corrupted, contains a string suggesting a lure related to downloading subtitles. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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
  • 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://trafficel.ru/strik?utm_term=baixar+legenda+the+l+word PDF link annotation
    • https://lakalenavis.weebly.com/uploads/1/3/4/3/134313358/37eb49d.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/dipene.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/4703932.pdfIn PDF document text
    • https://sumozizadux.weebly.com/uploads/1/3/4/2/134266097/jejuwupinufeg.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/nuruxodewavuse.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/6424386.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/bavorivomosagivize.pdfIn PDF document text
    • https://kesudidudoj.weebly.com/uploads/1/3/4/4/134477594/giwamuwepesekejumuvo.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/925a3f26-43a0-4361-a2b4-6aaad40aa46e/self-sufficient_definition_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/lafozamubowitabolo.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/nulgath_rune_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/5382110526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93a9bda-f673-4e34-9c2a-255e03284bf9/kpss_genel_kltr_konu_anlatm.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/astor_piazzolla_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cff572-19a8-485b-bd98-bff42391bc1f/simone_browne_dark_matters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1773bb-e54f-4d00-b711-36f94ddc7986/adventurers_backpack_skyrim.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_off0000b337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB337 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 5120 bytes
SHA-256: eca20ba684918e4c2462490ea2a46760e4c7b31be939600fdea47ecde8c9c9dd
font_02_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 11552 bytes
SHA-256: b5501455abb064275ff8787026164243e399f65d45666e7d8718a495b47babad

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