Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb9812ca81e627b…

MALICIOUS

PDF

88.5 KB Created: 2021-01-09 11:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a9e8ee68adaa92ed2d09155619a9d5d6 SHA-1: 984906cfe38c4e41a88d0960549c212c52540856 SHA-256: cdb9812ca81e627bacb4bbb0e82373af35bb9afb8427d77dcaf6db8ebcd7875c
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 0.9997

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/123?utm_term=tipos+de+tomas+de+camara PDF link annotation
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/490315.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/ruzofutur.pdfIn PDF document text
    • https://bopupuvi.weebly.com/uploads/1/3/1/6/131636777/a56c7d70361ea5a.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/cc0e7391-8ceb-4e4f-a382-cb9118a004ff/scenario_meaning_in_math.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/jazufuriwidazomo.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/zapasavug.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/big_tower_tiny_square_unblocked_66.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/76419639089.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/radov.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/stuck_black_screen_formatting_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c7c2e9-52b6-4de6-a69a-fb8a84507823/the_golden_dawn_black_clover.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_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 5136 bytes
SHA-256: 9cfd370a0b0f0f0e30e9e167b97cfe15568972013dfee574bb36f1520f482564
font_01_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 11500 bytes
SHA-256: 54fbb817615295a56edc4bdef233875a50568403e93a10da40885d1c7ea04cd0