Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71db74db5607151…

MALICIOUS

PDF

79.7 KB Created: 2021-02-13 04:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 14de95bdd56a022c79ab49ee818a7844 SHA-1: d47cc0def847f5b7674ca133cc7e7d98fc2df575 SHA-256: f71db74db560715152590b907caa48899b0a6032746347fb8042648124ba5df0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics as malicious, including a redirector link and a large link farm hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded links likely serve to direct users to malicious websites or to manipulate SEO, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=faded+roblox+piano+easy In PDF document text
    • https://cdn.sqhk.co/virixerusupa/vjhDgdx/wevamosebi.pdfIn PDF document text
    • https://rolavakewuxilo.weebly.com/uploads/1/3/1/4/131407047/nuxike.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/jesib3J/35002755246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_600c9b9f3f164.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/hgtKChe/whatsapp_wallpaper_images_butterfly.pdfIn PDF document text
    • https://womovenurobo.weebly.com/uploads/1/3/1/8/131872055/968161.pdfIn PDF document text
    • https://cdn.sqhk.co/pavuraxutem/RLahh1x/hex_empire_2_free_online_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_600de3aef10df.pdfIn PDF document text
    • https://tadesurirow.weebly.com/uploads/1/3/2/7/132711952/jikaworokonemuk-ropisiwuno-vudezewonejisuz-xojif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zidazimimaf.epizy.com/sepenuvuponobisebisuxupe.pdfIn PDF document text
    • http://wekapalipewux.epizy.com/game_karne_ka_tarika_batao.pdfIn PDF document text
    • http://datidalumoz.rf.gd/40653473838.pdfIn PDF document text
    • http://jibipadesubamom.epizy.com/96830214748.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_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 5216 bytes
SHA-256: 46cc1435ac9640121442cf35a0dfbbb863994bb8a9e116d7b6b7ebd0da2f6d92
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 15956 bytes
SHA-256: 0c5213b2e1a8cca0be34c8232e8817bb49d274c8e9fbd6fd7ca4cfe2df69b733

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