Malicious PDF — malware analysis report

Static analysis result for SHA-256 4309d889fca5f449…

MALICIOUS

PDF

75.8 KB Created: 2021-03-20 23:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3dbea1c892b750b2b1be75d127115237 SHA-1: 9038d213f00f90100fe4638e8a064a20ed7a825b SHA-256: 4309d889fca5f449a74feda7689ce0d2fe95ada21fbdaefae42c62d0cdf4cac3
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content or phishing pages. The PDF structure and embedded links suggest an attempt to disguise malicious activity as a legitimate document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=all+gone+book+pdf PDF link annotation
    • http://lutusogugifuj.iblogger.org/what_is_freedom_for_you_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/xhabQdL/11202554187.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/aPJgdum/97819712458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_5ff756c488de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_602486654e2ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5ffc66c6872a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_6016790fd6682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_6019ae6b2b16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fd3ce7b455b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_603f1dcaeb932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5ff140fea9b4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosamufudov.epizy.com/stihl_hs45_parts_canada.pdfIn PDF document text
    • http://mavusovemoritev.rf.gd/blood_type_b_positive_diet.pdfIn PDF document text
    • http://letelexedat.epizy.com/39396222978.pdfIn PDF document text
    • http://duresonorapalet.rf.gd/82359027717.pdfIn PDF document text
    • http://mosararivifu.rf.gd/13040119917.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_b2ca16cae47a47a4ab699043657b6231.pdf?index=trueIn PDF document text
    • http://gijewitog.rf.gd/baby_day_out_movie_in_tamil.pdfIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_25f1a19c85cd45819ce8f538fe8a4235.pdf?index=trueIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_2e1f06af1d29482b9c5c20a4547ddd42.pdf?index=trueIn 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_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 4916 bytes
SHA-256: dba18bd591f37a925ea072d88a56b4b571d487a30ec2522165d9a11121174fa3
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 11676 bytes
SHA-256: a85bf96692c64f36ac85f9c444994d3aa53f71be496815656c749406b9ed1c02

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