Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c7e7be8b82bbce…

MALICIOUS

PDF

69.8 KB Created: 2020-11-25 21:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d0f348e6e9fe6c47ed27014d80f4d14 SHA-1: 11afae0706b38c2468eaa83c4d2c269480d6bdc1 SHA-256: 05c7e7be8b82bbcec246f49e6ab2e61419e6988a9424b49869fcccda28a28a8a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with a critical heuristic identifying it as a PDF link farm. It contains an embedded URL pointing to 'traffnew.ru', which is likely part of a phishing or SEO spam campaign. Although no scripts were extracted, the PDF structure and heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffnew.ru/strik?utm_term=later+or+latter+half
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/be6e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7f0bbbf0-860a-4d81-90d8-5c5d9fbf5e59/7657533289.pdf
    • https://s3.amazonaws.com/zarusegibitumet/99903834875.pdf
    • https://uploads.strikinglycdn.com/files/94fa7beb-9f4e-4509-a83e-d60f659485be/vikram_vedha_2017_bangla_subtitle.pdf
    • https://uploads.strikinglycdn.com/files/c17d01bc-61dd-4f7b-a36d-788ffa127c7e/rv_deeded_lots_for_sale_oregon.pdf
    • https://uploads.strikinglycdn.com/files/b1ca92e0-24ac-4f76-bc63-b224974020a0/jabenimegiduvusijikadona.pdf
    • https://uploads.strikinglycdn.com/files/4195dc24-5e33-4d42-b1bf-22193962a657/21745564884.pdf
    • https://uploads.strikinglycdn.com/files/b9c6163f-1549-4c7b-aebf-b41ee8140e05/soneb.pdf
    • https://uploads.strikinglycdn.com/files/6cdf3832-e041-4a8c-bd5c-e3a50520e2aa/invalid_license_data_reinstall_is_re.pdf
    • https://uploads.strikinglycdn.com/files/94fc6d7c-940f-46bc-a868-77c3782bebaa/4576291477.pdf
    • https://s3.amazonaws.com/mawesenasijoser/blazing_star_apk_full.pdf
    • https://uploads.strikinglycdn.com/files/963ca5a6-427d-4ff5-9e45-60402168373f/2720570895.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c98b.bin
8d64b8e7ee80bccb3d03f32b7e413d33f193e4d9abf1520bd80909bbd54290c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 4252 bytes
font_01_sfnt_off0000d80b.bin
d3dcdaef6259c77f094891140a411b82a7db9bdd01fa39c013e08c2a63f2bfad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 10716 bytes
font_02_sfnt_off0000fc2e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 4324 bytes