Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c758e724e800d8…

MALICIOUS

PDF

72.0 KB Created: 2021-01-09 19:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 53ca014fe41831cb840617d021f1389a SHA-1: e7c2ae48cdb8fdbb838d79bddf6216d4154a2f90 SHA-256: 46c758e724e800d8e662451c1786eea48239308ccd6d477bc27d3629dd3fa602
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffmen.ru/aws?utm_term=calendar+app+android+outlook In PDF document text
    • https://rojujajaz.weebly.com/uploads/1/3/4/7/134727345/fonopug.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/id8ifT9/pretty_print_to_string_python.pdfIn PDF document text
    • https://cdn.sqhk.co/dupamotim/Sujachb/zombie_hunting_simulator_codes_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefotebe/9gdhiJb/pop_socket_servers.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/1W7HsQM/zarujogewikazob.pdfIn PDF document text
    • https://site-1175273.mozfiles.com/files/1175273/pictoword_level_39.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/6358164039.pdfIn PDF document text
    • https://site-1167971.mozfiles.com/files/1167971/venn_diagram_worksheet_math.pdfIn PDF document text
    • https://site-1175017.mozfiles.com/files/1175017/how_do_you_learn_to_sing_better.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5fc69148cf51b.pdfIn PDF document text
    • https://cdn.sqhk.co/nedovipirumu/gcjiXGs/70384625574.pdfIn PDF document text
    • https://site-1183169.mozfiles.com/files/1183169/tupexusedepazemila.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/fajujiju/24173140760.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/71162268535.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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 4744 bytes
SHA-256: d875cbdfaefc5f4e789cbf25a2d67ea04421170c3eaaf5b3d72af8ec018110f7
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 10644 bytes
SHA-256: de276633fe186f6c8843fa0c880920c1f36b111ce31855dfcce3efc7c7632fd8

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