Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfb604daad7473d…

MALICIOUS

PDF

69.4 KB Created: 2020-12-22 19:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eda52af206263f410e52f1089900531e SHA-1: 6107a6f5d5152e67666abcace1e03c69208d52bd SHA-256: 4cfb604daad7473d1659daf374a80dd1ef2623ce11d74b60333d6c1d9076dcc0
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to manipulate search engine results. It also contains an embedded URI pointing to a suspicious domain, likely intended for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=digital+marketing+certificate+course+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5fc27e4b7f2d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5fbf862d3a18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452395/normal_5fb8490b10a1f.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/godelekobosedulavej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_5fdbfb5e847e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fc91e0b9933b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0d900d26ff1194f736c6f/t/5fcba40f21c0486e9198e61f/1607181336116/freedom_rock_album_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c5cecf-06fd-420a-bf57-b5617232aeb2/range_of_a_negative_parabola.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/38099932562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ad3ea1-5433-4c6d-abec-c1f6f5c0d305/persona_5_how_to_fuse_satanael.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4871b180-6943-496a-9dc4-811e007d8230/unit_elastic_supply_curve.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3c655d26ff1194f85c811/t/5fd68b82164d0f203c821435/1607895938873/project_executive_summary_template_ppt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde968fd548586ddd28100e/t/5fdf55f3ef735726d26cb329/1608472056406/beko_bxif243x_electric_oven_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 5148 bytes
SHA-256: 06d866f63e9b23da59e5ff4f06237b4d8b2ce8aa2d6d7da4fe2c34750ebfce01
font_01_sfnt_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 11228 bytes
SHA-256: 7513c7cae9bca9b34e420e6308e609be2d52b0ab81b14af7730ea7385b94f2cc
font_02_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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