Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4b553938e77f31…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 02:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be632d943cede86f11cbd12edd2fc61c SHA-1: 6ec1cd016f01fe36040ef08903ff919c9493e4e9 SHA-256: ea4b553938e77f31d31053208280099d349d7ef3f9175718856b65365dd832e9
244 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to disposable hosting and redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent, likely for phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://yafferge.ru/strik?utm_term=becoming+a+person+of+influence+john+c+maxwell+pdf In PDF document text
    • https://cdn.sqhk.co/nezusoxe/ei49Uhd/demon_simulator_game.pdfIn PDF document text
    • https://nikojaba.weebly.com/uploads/1/3/4/6/134683319/jatavuwuzakoxejaz.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/hcgf94X/anime_iphone_x_wallpaper_live.pdfIn PDF document text
    • https://jujokubibafa.weebly.com/uploads/1/3/4/6/134621517/2bfecd839959.pdfIn PDF document text
    • https://cdn.sqhk.co/semobisugigi/agcGBhh/36954248167.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/hh8gcdl/skateboard_tricks_for_beginners.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/gugipilanakebur-dijarudej-tokabejusudun-pabumav.pdfIn PDF document text
    • http://zunuvubono.22web.org/against_method.pdfIn PDF document text
    • https://kasureketox.weebly.com/uploads/1/3/4/8/134856927/884795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_30d272e7b2294ed585fdc88bb5a5815c.pdf?index=trueIn PDF document text
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_0577f50b8a3143498d00b66a06798964.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_abef0315825e493c95870b7be8756c64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdbc39e-2400-46a7-89eb-590609244aee/95328277004.pdfIn PDF document text
    • http://xobubujek.epizy.com/wejur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea996ba2-4d72-483e-b1fb-91e7ae273331/38989462953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/362598d4-f2b4-482e-ad95-993f916cf92c/pivegag.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_a52c7b49cee745ada6f5573d8882d8cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed11e148-d27c-4610-9a53-e2618c0d729b/spindle_turning_projects.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_97cfd2bf55034754a5d7a7acd0403093.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_0bd848af484242659c6f201139e15295.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_5c49f030b2a442aa9bfefe8133e1998b.pdf?index=trueIn PDF document text
    • http://ziwivalotezeti.rf.gd/matrices_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7d284c-1514-415b-80ac-7e3099a93009/zinawipubolawokib.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_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 5856 bytes
SHA-256: 990804ffe6b5a518d8e463d5ac0ad07da1249f61a5f30546b0e934d409338ace
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 11236 bytes
SHA-256: 67a65a255f009afd503016e16e33de7cf3d9f30c93d31c81a3d943d08443d280