Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be6a922c875d79f…

MALICIOUS

PDF

80.1 KB Created: 2021-01-04 13:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7798191cdddeea043e79dd0cc07b82d SHA-1: 93798e7e6bbfb67f32cbd78da01d1b478081e779 SHA-256: 5be6a922c875d79f5128a27c3bfdaae9a06f4c5202387b2ff81f12e1a9b4208d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=everyman+script+pdf In PDF document text
    • https://pixigakamorage.weebly.com/uploads/1/3/4/3/134351623/9785346.pdfIn PDF document text
    • https://vulagikivup.weebly.com/uploads/1/3/4/2/134234906/eea0a4ce91.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/5f9e4023540.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/c8fc054741b3eba.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/fd43d43a33.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/misovap.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/dhfCEts/1954751867.pdfIn PDF document text
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/mixaziz.pdfIn PDF document text
    • https://jujepuwajepoxox.weebly.com/uploads/1/3/4/4/134466337/5541205.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/jazxIgi/the_lightning_thief_chapter_15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2561c87c-4c55-476d-9aac-af2ee2eb094c/center_for_family_guidance_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9bdd26-4ae1-435b-afb6-5f2ce37d27e3/101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16685534-61c2-4f2d-97c4-a034af99563a/23437831775.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 5064 bytes
SHA-256: 3e615b61ab29c622803590df81cbebea5b8acea4245f122c62b6a15c15a4aa72
font_01_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 11272 bytes
SHA-256: 6237a60fa543781e2fc2286b8b1a08b9f55caa0258cf8b81f12bff10625d7e6d
font_02_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 17060 bytes
SHA-256: 1d0401c27f047ff43f267ea28e77d19ee5a24a98c95e3ca1fe3a4fd8ab8d80ae
font_03_sfnt_off0001254a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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