Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a60ec91ff8718b…

MALICIOUS

PDF

71.8 KB Created: 2021-01-06 07:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d7136565f969584369b0442957b6d84a SHA-1: 9a7ea3539787ba36dc9d753463aaf016a26f1f89 SHA-256: 39a60ec91ff8718bf9555a171686be74c4b4d744f11d5276505d763393666a0c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it is likely part of an SEO link farm or a phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://trafftec.ru/aws?utm_term=letter+writing+format+for+absence+from+school', are used to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=letter+writing+format+for+absence+from+school PDF link annotation
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/9557017.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/8385935.pdfIn PDF document text
    • https://musopikulaw.weebly.com/uploads/1/3/4/8/134851971/xelenofade.pdfIn PDF document text
    • https://cdn.sqhk.co/dovewobojeb/8ib3haH/25271667619.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/lesekokulazigefu.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jj9jaoi/4_pics_1_word_game_answers_all_levels.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/gateme/nabonepagefiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ac34e1-6f49-44d0-bed4-aadc8f111bd5/31585644603.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/56438363658.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/28467493509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6e6f13-2b14-4118-9dd4-3a5fded9860c/uber_roadshow_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c08cedb-6786-4b0e-8a1d-fd12caef57af/princeton_review_mcat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e4706d-40d5-45f9-8bbf-b91d5599c0e3/dotut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2884ae25-7d9d-4b40-ab24-8985ecfb18ac/skill_books_kingdom_come.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 5468 bytes
SHA-256: 042bcf17642e539b9e56b90845417729da0879fd763aa1fd2ba95299941c89e2
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10484 bytes
SHA-256: e52c7788b0fe2fe84de0f213829ac873989e35e04ec53da2755e96765983bf40

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