Malicious PDF — malware analysis report

Static analysis result for SHA-256 891712770efafd1e…

MALICIOUS

PDF

79.6 KB Created: 2021-05-24 01:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fb4768ab94e003bd91fc2cedc103d87 SHA-1: 71e591036ffb41e6b56e4adb1640a8f3e267fde1 SHA-256: 891712770efafd1e0b0fb653b1362af0cb3a4b87b67263e00a612b7b5f0f6fa3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest an attempt to redirect users to external content, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=does+backyard+baseball+work+on+windows+10
    • https://xezefamije.weebly.com/uploads/1/3/4/3/134352880/gimaranupamizak_tuxaba.pdf
    • https://cdn-cms.f-static.net/uploads/4480162/normal_604b0e8a6929f.pdf
    • https://cdn-cms.f-static.net/uploads/4447663/normal_60596ddf02d70.pdf
    • https://cdn-cms.f-static.net/uploads/4445555/normal_605c99146007f.pdf
    • https://cdn-cms.f-static.net/uploads/4506159/normal_60691e1aa2941.pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_601279f04911d.pdf
    • https://cdn-cms.f-static.net/uploads/4478928/normal_5fd844527f099.pdf
    • https://cdn-cms.f-static.net/uploads/4451035/normal_6065a691e992a.pdf
    • https://cdn-cms.f-static.net/uploads/4427809/normal_6019d5d808810.pdf
    • https://cdn-cms.f-static.net/uploads/4371783/normal_60490350e7559.pdf
    • https://cdn-cms.f-static.net/uploads/4421215/normal_6023fa0085adc.pdf
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fd2fcb5bb873.pdf
    • https://cdn-cms.f-static.net/uploads/4502175/normal_604a664f42317.pdf
    • https://cdn-cms.f-static.net/uploads/4453900/normal_600eb09d222ba.pdf
    • https://cdn-cms.f-static.net/uploads/4417222/normal_600be5ed65ba4.pdf
    • https://cdn-cms.f-static.net/uploads/4386087/normal_602428853003e.pdf
    • https://cdn-cms.f-static.net/uploads/4499021/normal_604b065697c7f.pdf
    • https://cdn-cms.f-static.net/uploads/4483104/normal_6027de7bac05c.pdf
    • https://cdn-cms.f-static.net/uploads/4410214/normal_60430ee26acf9.pdf
    • https://sukifife.weebly.com/uploads/1/3/4/3/134334287/wezanolak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d4b522a9-cfe6-4956-b891-713199cc1557/piweduzevijuvarofaxuf.pdf
    • https://uploads.strikinglycdn.com/files/3ccf0653-da56-45c1-8294-4bdfbb98872b/lowrance_x-4_pro_manuale_italiano.pdf
    • https://uploads.strikinglycdn.com/files/ba36793d-f0d8-459d-96b6-87a51de9d4e3/45841913231.pdf
    • https://uploads.strikinglycdn.com/files/4a3c7cf3-ebd6-40a4-959b-8015f6b5b689/46460254278.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_off0000f8bb.bin
e3d0202c6f9d638789ddba9502256922f4303a2c8f89ae8a59c233fcd019f0b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 5524 bytes
font_01_sfnt_off00010bb5.bin
7d16949075d6392eb6ec139f9c018a37fd565f27e2fa219e37abfc6551597b35
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 10876 bytes