Malicious PDF — malware analysis report

Static analysis result for SHA-256 29dbb7cb76e95a68…

MALICIOUS

PDF

64.7 KB Created: 2020-11-14 10:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 77c03ad52e4e5ce5b18f49b8dfc961cd SHA-1: 937388da8dd18814c3d2eb61b356aa44dcdb3dc7 SHA-256: 29dbb7cb76e95a68dcf17f8551b61c61cffe9a76015def481f95f5a1355e514b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet answer key'. The presence of multiple external PDF links, including one to a redirector, indicates an attempt to lead the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ggtraff.ru/123?utm_term=metric+mania+worksheet+answer+key In PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/vimimijidife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5f9a5ffb9f7e0.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/nokiva/oxidative_stress_and_cancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc57f44-1122-4628-8f34-1ea18b3c818d/lapubavorifonijosawalun.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/judas_priest_breaking_the_law_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/caupolican_ruben_dario.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/18997078059.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/aamc_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372fee7e-21ae-4ff8-baa9-85aef0387ede/42063608675.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_off0000c0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B3 5268 bytes
SHA-256: 66dcd9e845549db8698a6bb8ff62c17bef42af0ba45350c7d8bfcb2fbb88e84a
font_01_sfnt_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 10384 bytes
SHA-256: ba331233791c8a0d5d2cf05c50c269e31ac6e7a2bc1e02d9dfef4ba4ee2b62d8

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