Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cbefbd3e9377b3…

MALICIOUS

PDF

86.5 KB Created: 2021-01-15 06:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8af867b659d90efe7dc7bfdc90797bd3 SHA-1: c696fa230bf9735503807eac2a0c407ac2aed7e3 SHA-256: c1cbefbd3e9377b3ab07550e27edcb073ae7d48e45069870a5814b5d2032b41c
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to .pdf files with seemingly unrelated titles, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafftec.ru/aws?utm_term=audiobook+free+s', is directly associated with the malicious classification. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect users to potentially harmful content.

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=audiobook+free+s PDF link annotation
    • https://site-1177969.mozfiles.com/files/1177969/cantigas_de_escrnio_e_maldizer.pdfIn PDF document text
    • https://site-1180237.mozfiles.com/files/1180237/gunship_strike_3d_game_hack_version_download.pdfIn PDF document text
    • https://site-1177796.mozfiles.com/files/1177796/amazon_a_to_z_claim.pdfIn PDF document text
    • https://site-1178549.mozfiles.com/files/1178549/canvas_parent_app_login.pdfIn PDF document text
    • https://site-1178643.mozfiles.com/files/1178643/86302862106.pdfIn PDF document text
    • https://site-1174988.mozfiles.com/files/1174988/peacemaker_gun_replica_for_sale.pdfIn PDF document text
    • https://site-1168143.mozfiles.com/files/1168143/ultimate_game_buzzer.pdfIn PDF document text
    • https://vezikiga.weebly.com/uploads/1/3/0/7/130739663/5153182.pdfIn PDF document text
    • https://wipezupogev.weebly.com/uploads/1/3/4/3/134307181/dojebuxuba-bumetuzu-nijekeme-gowuviwakunat.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/bulikowexunepov/gunoxupen.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/harmonize_ft_yemi_alade_911_video.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/solution_architect_cv.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/rabijinavipuwinefisejozow.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/betfair_apk_old_version.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_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 4852 bytes
SHA-256: b84d2f71266541e5949d9d5e6b20969a185fef291776877c648e08a77a66ca1d
font_01_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 11908 bytes
SHA-256: 6c8c95d42c580b8bc203bdeeb9c2af108760bc15f33c003d4d10f78756ef5e2c

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