Malicious PDF — malware analysis report

Static analysis result for SHA-256 075b04f681ffcd7f…

MALICIOUS

PDF

81.4 KB Created: 2021-05-23 23:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4ab2e43b8638063cee14ed5cb4d98fa4 SHA-1: 5b5e5156a637c9cdc8a7eb151beccf6f76414bc2 SHA-256: 075b04f681ffcd7f404540831f03943fef7038e06f4d62ad98fe8d6b1bd10c45
186 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 hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically identified as Pdf.Phishing.Trojan. The embedded URLs likely lead to further malicious content or phishing pages, and the document's content is a lure to encourage clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=how+to+install+armored+cable+gland PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5febd02f13ade.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/362c6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_6058e953120ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6017d4d9870ea.pdfIn PDF document text
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/fipoxu_lagudixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_5fd33913b6e91.pdfIn PDF document text
    • https://falomomorojed.weebly.com/uploads/1/3/1/4/131438216/0545d4c23ac4.pdfIn PDF document text
    • https://kefejuze.weebly.com/uploads/1/3/1/6/131606268/8952698.pdfIn PDF document text
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/wekote_sipevusagima_digelidofakon_lebabexes.pdfIn PDF document text
    • https://bemawavopul.weebly.com/uploads/1/3/4/6/134692962/pidowarudelaginizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_6069ee4ce7426.pdfIn PDF document text
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/69c29d68d.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/keputupaxokafebib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_603d4980dbac3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/784973f6-298f-4d0e-a159-4d26dfee95d3/hp_7525_problem_with_printer_or_ink_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b58dd7-eced-4d9e-83bc-63d22e04f0a1/i_was_sitting_at_the_counter_counting_up_my_drug_money_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c132fe-12c8-4597-96ff-38c9da97ca8d/vampire_diaries_season_1_episode_10_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff18c67d-345a-4412-b535-c55f5007d943/37006766874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0878518e-6c17-46df-969e-4875a13f3b45/how_to_connect_wii_controller_to_dolphin.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5452 bytes
SHA-256: 6b6e49f984582a9040a01c7b609e31f3832041a96d01fb0d164a418a69dac445
font_01_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 11416 bytes
SHA-256: 209eb208b518b092d50f439b724ef6d86f6b18f52792d022d9365636008d8d59