Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2677e9a0b7588df…

MALICIOUS

PDF

59.9 KB Created: 2020-12-06 15:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3410f37e99812e8f1950e1ed166193c2 SHA-1: 22139ea7cd294d8994ddc76c5e39a2321b7452b9 SHA-256: a2677e9a0b7588dfbb6a56e18ee1accdff48b84f4289fe4d84ae4fc1e9f33934
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 pointing to disposable domains and identified as 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 distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://ggtraff.ru/strik?utm_term=amazon+negative+upt+reddit In PDF document text
    • https://kezodedekupamo.weebly.com/uploads/1/3/4/6/134605888/fumokik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f94d78355900.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/jufodamotafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_5fa9af095c707.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/88637bda8d92.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/refixirajakemoxosar.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/c9440356.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/xosikomudo_sawulixudovet_domixisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f891e18b117d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_5faa81d572642.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/nelefozarali.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/pegek/98130918105.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5313f104edf1d779d1ce4/t/5fc6f6bc0791337046d823b5/1606874813532/kexurexo.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/xorutitidewem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe386b97992eb55c938e/t/5fc2d01a3570fb44d1602991/1606602778616/sebujiwaz.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_off0000b0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EC 5168 bytes
SHA-256: 05e12c97e3d52adf89a290bd70ba4f40a408736b7ba29945c6b3dbd61f7bb5c7
font_01_sfnt_off0000c276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC276 9520 bytes
SHA-256: 45c04587027866a020628b1838ccb7cbf6b3bebb67ebe791c2b4cdf5f4760257

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