Malicious PDF — malware analysis report

Static analysis result for SHA-256 7619ccb368810818…

MALICIOUS

PDF

67.5 KB Created: 2020-11-18 12:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 662b76008124565d77eed2cfbf0f06a9 SHA-1: b5434635c70ba1cc4560007c8b656c28af801398 SHA-256: 7619ccb368810818b9ad1d5780d4019d180b2aad00a7e842372bba385340be57
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, with one pointing to 'https://traffset.ru/strik?utm_term=basic+guitar+chords+youtube', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to guitar chords and the authoring application, likely serving as a lure. The presence of PDF-specific heuristics and the ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=basic+guitar+chords+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475203/normal_5fa54d6c2d517.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/duweb.pdfIn PDF document text
    • https://lodufowuk.weebly.com/uploads/1/3/4/5/134593986/naxeja_ravaz_vudozadu.pdfIn PDF document text
    • https://sumudopijo.weebly.com/uploads/1/3/4/7/134716274/pumogixiwebex-konik-matesike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_5fa907b5d7866.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/lebelenufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fab16872103d.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://uploads.strikinglycdn.com/files/22d96c22-996f-459a-a46f-2cd6d16a5c61/1636374401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be7adc4-ea32-41d7-ad82-7f7d4518c3ca/ccloud_tv_guide_watch_channel_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4640d5-808f-4eb4-8904-cf1faef10dc9/mebupofituk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623c8436-52e8-4be1-80b3-d27cdbc1c9a2/digital_planner_notability.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_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 5236 bytes
SHA-256: b08d72ebbd6e327f691f4f37db516b60427469d29bbc3d4d375f36c554fd9832
font_01_sfnt_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 9704 bytes
SHA-256: 32cefd503597c378389031695316297e25159c4a6f5fdea9bbce56042eeabed9
font_02_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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