Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a6c1e63b458c76…

MALICIOUS

PDF

73.3 KB Created: 2021-02-02 23:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c5bba76b83af0af79a4d83caead553e4 SHA-1: 602db22495fcd61cc22f02b4d039008baaaba7df SHA-256: 08a6c1e63b458c760cc04baa5e0265c21a00bb3c4c65e73098e78f54a2b1f600
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, indicating an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://yafferge.ru/wb?keyword=synthetic%20division%20sudoku%20worksheet%20answers In PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/b00e90b5.pdfIn PDF document text
    • https://fabexitib.weebly.com/uploads/1/3/4/1/134109013/komesabigojuja-gepotogosurive-sijukod-duwapujowuxa.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/496dc152.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/3a78126077bfb.pdfIn PDF document text
    • https://jetesobamu.weebly.com/uploads/1/3/5/3/135323438/lirokomaboteru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivala/invitation_card_design_template_photoshop.pdfIn PDF document text
    • http://zudozam.epizy.com/gobuwijosurigopugubex.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/87525745770.pdfIn PDF document text
    • http://webubekesivamuf.epizy.com/93738053458.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/bovatupewunevupuse.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/sparklehorse_it_s_a_wonderful_life.pdfIn PDF document text
    • http://vaxokepa.rf.gd/aalpha_information_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/72417769457.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/guide_affutage_couteau_japonais.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_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 5416 bytes
SHA-256: f440b9ceb242f9521136b74c0ed26404d4a115d034ce2d107055b393bd9d319e
font_01_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 11432 bytes
SHA-256: 1829fbd18d2c3cfe8ad15dab559beb3fd6dc6cecd45e84c35500d9c781f78fdf

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