Malicious PDF — malware analysis report

Static analysis result for SHA-256 a252b481feef834b…

MALICIOUS

PDF

79.2 KB Created: 2021-05-30 04:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d53f376b1145652cc4183aa47c7498 SHA-1: 7a8ecaf1db2c713c26768acba7b21a37c547750d SHA-256: a252b481feef834b8a304400916a12a1f31977e9597adae124b3d907015e8d2a
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 are dynamically generated and point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious content, potentially a phishing page or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=drayton+digistat+scr+wireless+system+instructions
    • https://cdn-cms.f-static.net/uploads/4496216/normal_606ccbc42ed04.pdf
    • https://cdn-cms.f-static.net/uploads/4426270/normal_606e2e428f697.pdf
    • https://cdn-cms.f-static.net/uploads/4374178/normal_606e25382a012.pdf
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/e0fb6332ba08.pdf
    • https://kikokemez.weebly.com/uploads/1/3/5/3/135331375/8197645.pdf
    • https://cdn-cms.f-static.net/uploads/4406455/normal_605ef80641888.pdf
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/def34d3.pdf
    • https://cdn-cms.f-static.net/uploads/4487626/normal_600dc26268477.pdf
    • https://cdn-cms.f-static.net/uploads/4387699/normal_604e81c25450f.pdf
    • https://pivikupawo.weebly.com/uploads/1/3/4/3/134356995/278e70f673b9.pdf
    • https://gesinanafu.weebly.com/uploads/1/3/4/4/134481382/583645.pdf
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ff06b0094d1c.pdf
    • https://static.s123-cdn-static.com/uploads/4458829/normal_5fe22d777c7dd.pdf
    • https://kogemujifogez.weebly.com/uploads/1/3/4/3/134344524/c83455.pdf
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5ff7f3d9ec4c7.pdf
    • https://cdn-cms.f-static.net/uploads/4450632/normal_6034893ccce6c.pdf
    • https://duvokazi.weebly.com/uploads/1/3/4/1/134108747/tikazivaxogu.pdf
    • https://cdn-cms.f-static.net/uploads/4410207/normal_602686823cec7.pdf
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5ff8db57d32bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/08c56ad1-916e-486d-b3bf-9c4526413848/what_chapter_does_snowball_leave_animal_farm.pdf
    • https://uploads.strikinglycdn.com/files/87b8b768-2b5e-47e9-acc6-73755bb4a86c/poulenc_trio_for_oboe_bassoon_and_piano_youtube.pdf
    • https://uploads.strikinglycdn.com/files/a00d78d5-d869-43b1-b48a-4868cf7f14a4/mekozorigutat.pdf
    • https://uploads.strikinglycdn.com/files/55e9536a-d9c8-4caf-b719-2dc1cc991481/chamberlain_universal_clicker_black_garage_door_remote_control.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_off0000f541.bin
0c335f1572c177e74ae890c63e477df74d9f8581adf05be85f63c62f37ea326e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 5452 bytes
font_01_sfnt_off000107d6.bin
32d703d1c998f9634df9de3832b5d76a1e6381a38e60f96635817a81f987361b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 11536 bytes