Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12628b769a64d02…

MALICIOUS

PDF

63.8 KB Created: 2020-11-22 04:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305a20d8de000d7ab5c24810fdadb22d SHA-1: c188e35dfb8c1d0eb48757ad1f0d9c105e8c496b SHA-256: d12628b769a64d029c143e2ff485776bd89aa16b4663e78a10991e3d706d8846
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=blur+background+hd++for+picsart
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f9b2ed09ad60.pdf
    • https://kegilosibumu.weebly.com/uploads/1/3/4/5/134513635/rifasavomekanip.pdf
    • https://cdn-cms.f-static.net/uploads/4421960/normal_5fb8647a92cf3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9520ee75-49cc-409a-ac52-874d8442100f/85389973731.pdf
    • https://uploads.strikinglycdn.com/files/655b9340-467c-4d2d-b644-9c42a6731f83/free_codes_for_minty_pickaxe_list.pdf
    • https://uploads.strikinglycdn.com/files/e4900b45-77e4-48a6-bdd1-b69a086ba812/40097442536.pdf
    • https://s3.amazonaws.com/lixuzo/pizapukolizebibebebasazi.pdf
    • https://uploads.strikinglycdn.com/files/f17417df-daae-4c4e-918a-750a07ff46b8/28019930010.pdf
    • https://uploads.strikinglycdn.com/files/5eed8e2d-9595-43d8-b50f-cc0d1b53a7ef/79477233296.pdf
    • https://uploads.strikinglycdn.com/files/0512b64d-0c3a-4df6-bdeb-6d27c2085687/38855547001.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc2f.bin
a1e6abb6cb106bee93a5efb434986cfcf5e13c5d377f4e126aedefd21cf17cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2F 5672 bytes
font_01_sfnt_off0000cf72.bin
9dfc9200439f60650f904ad3b735911861ed40fa50d6464b32feb725014887e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 10416 bytes