Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47ddd52036024fa…

MALICIOUS

PDF

77.7 KB Created: 2021-04-05 20:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a05cb5a78c071a9eb19e47da153d314 SHA-1: 78e3ee728c6b33dcc164d30e78d45f9b16c7fccf SHA-256: c47ddd52036024fa733dc5be2349b12776517a194621e8d13cf1fd8cf697c753
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=how+to+make+bean+bag+toss+bags
    • https://cdn-cms.f-static.net/uploads/4477183/normal_601db4858d692.pdf
    • http://form-lnstagramverifiedbadges.com/pejijemh350v.pdf
    • https://cdn-cms.f-static.net/uploads/4454813/normal_6031ee2f7c472.pdf
    • https://cdn-cms.f-static.net/uploads/4368759/normal_600edb6c43fe0.pdf
    • https://cdn-cms.f-static.net/uploads/4454990/normal_604e975ed46a4.pdf
    • http://mini-camera-super.club/308401426394q13.pdf
    • https://static.s123-cdn-static.com/uploads/4455660/normal_6001920e37af8.pdf
    • https://static.s123-cdn-static.com/uploads/4386837/normal_5ffe68283150b.pdf
    • https://cdn-cms.f-static.net/uploads/4377717/normal_603c61f212711.pdf
    • https://static.s123-cdn-static.com/uploads/4422368/normal_5fe4036657a9e.pdf
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fe1a8eb93864.pdf
    • http://posadukik.getenjoyment.net/watifo.pdf
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6027d82a50b5d.pdf
    • https://cdn-cms.f-static.net/uploads/4454055/normal_6069f1ba8c124.pdf
    • http://salleapp.xyz/first_aid_guide_vanilla_wow_hordeebla8.pdf
    • http://nikecortez.net/712683670242k152.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_4ad67d7daee54c458aa947453fa07469.pdf?index=true
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_0aae4dd48b504962ac8306d05d52286b.pdf?index=true
    • http://netawuwimirixor.onlinewebshop.net/1926079829.pdf
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_a95264e15460488693458af2b8857368.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_825579d27c254ad988854803626f4702.pdf?index=true
    • 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_off0000f051.bin
4fb01c1a138804c02bfebd4bae3c6f614df50c096c6bcbfce89c8cc3141d5ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 5132 bytes
font_01_sfnt_off000101cf.bin
c1b2eee1739d0b2f622445af5b99b2bcc31b6c777405a5c208b43aa6d07a876c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 11108 bytes

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