Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf2c961b445e0ef…

MALICIOUS

PDF

81.0 KB Created: 2021-02-12 01:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6611bb6c7c0e01cd94d8b353bbd0a49d SHA-1: 4aab48dce839f3698c4c643978a886a74a710da5 SHA-256: 5cf2c961b445e0efe3f36dba3f5ec59a877aac894a0d683f587abb7c669a0401
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. One URL, 'https://baarspo.ru/wix?keyword=chemical+bonding+vocabulary+review+crossword+answers', is particularly suspicious due to its structure and the domain. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wix?keyword=chemical+bonding+vocabulary+review+crossword+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5feb413cd41cd.pdfIn PDF document text
    • https://rimimasosonajis.weebly.com/uploads/1/3/2/6/132681992/kinazusijewis.pdfIn PDF document text
    • http://bionatur.space/drivers_ed_permit_test_answers_floridacwdn4.pdfIn PDF document text
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/wevum.pdfIn PDF document text
    • https://tifixexeruwa.weebly.com/uploads/1/3/2/6/132682204/4994343.pdfIn PDF document text
    • http://fridgeservice.ru/louisville_attic_ladder_partsbf4ha.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zinezalidoratov.rf.gd/internet_safety_worksheets.pdfIn PDF document text
    • http://joxupabazifo.rf.gd/wuwakepazutubize.pdfIn PDF document text
    • http://lenepozomewu.epizy.com/56343887210.pdfIn PDF document text
    • http://genenapukiral.epizy.com/sutobedo.pdfIn PDF document text
    • http://vanabigura.rf.gd/software_sites_list_for_pc.pdfIn PDF document text
    • http://piwapikefiraxi.rf.gd/52965321907.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 5652 bytes
SHA-256: 2dda4fd842462790ef80d7229a1139988d500cd73e916122844e65ba0e8de532
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 11156 bytes
SHA-256: 45990568cd094d7a1420251bd5c177fad642b60506337454e4d38ffb607474e0
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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