Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbc33baabcac903…

MALICIOUS

PDF

74.4 KB Created: 2020-11-20 10:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1fac50ba3338b39858e77cba0a703626 SHA-1: d9b0349f6fa26ec9cd87f15cf6b348498c91bf94 SHA-256: 0fbc33baabcac9037bfb125e2f301cc99148f08b47c038880bf2b7ba5cc57d53
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 0.9998

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://trafffi.ru/123?utm_term=apk+spotify+premium+android+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454056/normal_5fa2cf4a70908.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/kamemewop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_5fa51cc6a8863.pdfIn PDF document text
    • https://joxinisedubetif.weebly.com/uploads/1/3/4/5/134594754/juxibiw_zasewelagemaz_sovotanotix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464874/normal_5fab879c40c3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5f8d4a9e1da54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_5f9db1c92839f.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/sazomo/76681911490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6320aab9-de1a-4665-9cad-b45d39f21f08/vakemozagisufise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fde284-61d6-4d91-8054-f951a398bb79/53293820149.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/splatoon_2_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/77708551500.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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 5584 bytes
SHA-256: 60ce5a85306b8d35a725fcebaa06a50fa23679cd83db5d6d09826b7c2efedb37
font_01_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 10728 bytes
SHA-256: 96f4a785841a0178e355ddfdb3ec380114982bd1bb9f0146fb79e6b04ddd88d6