Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e7d9d243bea251…

MALICIOUS

PDF

68.4 KB Created: 2021-01-13 09:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 122d8cb934d0538ba3e54472432b4675 SHA-1: 95302cad7db949c9929791749f8bd316702f130a SHA-256: c5e7d9d243bea251b7ede2d02a04f1e0fed7db4827147dc8c5c34e3bb7ffabf6
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host and deliver malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://cctraff.ru/123?utm_term=the+wheel+in+the+sky+keeps+on+turning+lyrics In PDF document text
    • https://luzuredero.weebly.com/uploads/1/3/4/0/134016924/042535.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/gisegutibakasetajipi.pdfIn PDF document text
    • https://site-1220223.mozfiles.com/files/1220223/survival_on_mars_3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_5fbb10c6ca20a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5ff7fbd86f182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370072/normal_5fed3df5c9868.pdfIn PDF document text
    • https://site-1177196.mozfiles.com/files/1177196/charades_game_show.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_5fb880373bc2e.pdfIn PDF document text
    • https://mabelemaje.weebly.com/uploads/1/3/4/7/134705401/vutefub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5fd2d948b577c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_5fdb678573a28.pdfIn PDF document text
    • https://site-1174609.mozfiles.com/files/1174609/is_the_arena_war_dominator_worth_it.pdfIn PDF document text
    • https://site-1223179.mozfiles.com/files/1223179/arytenoid_cartilage_vocal_process.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_5fe79b8acee39.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/voxipanovigepiv/pesufexavagogofefofamire.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/crohn_s_disease_guidelines_ecco.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_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 5192 bytes
SHA-256: 73248981c17786e63052bbe61217a5ca6b5c125960922a15bfb05515e62fcdef
font_01_sfnt_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 13820 bytes
SHA-256: deec27c2e5fe232685b914678449bb7697aa36aea6f450e30bccba0616a94298

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