Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e76597d9e0e433…

MALICIOUS

PDF

67.1 KB Created: 2020-12-16 20:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 849097951c9cdf6257189fa3ba6c0515 SHA-1: 1c334f18730a010c31ec39a1bd8a233a30401e75 SHA-256: 42e76597d9e0e433c5660013d7cd5dec7c05c6601b1d2a26b89113b6add375f7
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic firing indicating it points to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of malicious URLs suggests an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=lincoln+hall+chicago In PDF document text
    • https://vurazomuloja.weebly.com/uploads/1/3/4/3/134322302/1e3f6dcdb8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7dc3dfdd95b60d4c91c/t/5fc488643485235c8657715e/1606715493620/avalanche_unblocked_games_66.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe859cb-8b8c-404d-9ada-102d43ed680f/62137171441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8122f1-67a2-4a41-a5fd-9a1c6b6057c4/45011899276.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79ecceddbb05c68963a2e/t/5fcda6e78a55f2188b943379/1607313128932/trending_hashtags_on_twitter_worldwide_today.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcefd41af5bf52c3262f58/1606217685280/pokemon_professor_exam_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a234850f-e394-4141-b4ea-68af79bb15c2/68430967105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34723df8-a2e0-4e7e-ac86-26f3a3e6f386/ethylene_glycol_boiling_point_under_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c1d6b2-135e-42e2-b3f7-202cc3f8da3c/barrilete_hidraulica_definio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa72a97-4d32-4abb-8449-b54d53d8b3d7/62100812567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad65faf5-5da3-4be8-b95b-e9c0b62d0903/bofuwufasolenalivudok.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5184e1c8c7413144d0b9f/t/5fd6d3170f11661d4c3d1836/1607914264328/komozopedoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac4e610-4c59-44da-8d07-c98d9b7f0615/where_does_crossing_over_occur_in_plants.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_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 4728 bytes
SHA-256: 3c5b3a4fcc1ad8748ff2a5b12eb02aa793ab50e9e27de52568b4cd2d705ad614
font_01_sfnt_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 11444 bytes
SHA-256: e5087e461f54175dcc7157b04b3818799fc12ba22d7cae6b210a05af426c03a8

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