Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eb7f24e49d5011…

MALICIOUS

PDF

81.9 KB Created: 2021-04-20 10:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 642934a16bb4018d57fb8bcdd86df95d SHA-1: df3d0f6d019fde98fff198817dda936203691cbd SHA-256: 40eb7f24e49d50110a9411526e701b6674c1b1d72be6eb101ccad0795f14b57e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/strik?utm_term=singer+sewing+machine+4423+reviews PDF link annotation
    • http://luminar3-download.xyz/do_red_squirrels_eat_grey_squirrelsa3var.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5fe0ecbc86d39.pdfIn PDF document text
    • http://ziziluwifupebus.22web.org/83736409844.pdfIn PDF document text
    • http://naturaleone.space/32566721853iz2t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5ffe95ab59a78.pdfIn PDF document text
    • http://white-x.fun/barasunarakoubrxh.pdfIn PDF document text
    • http://idealicaitalia.website/13778831241hm2dg.pdfIn PDF document text
    • http://servicesforsupport.com/binabegixjxnk.pdfIn PDF document text
    • http://bestrongbyg.com/wexutubegikivajivipa7c2xc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6024ab1878768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475197/normal_5fc7e87880169.pdfIn PDF document text
    • http://golomashvanna.xyz/vatovibuliturt8kpq.pdfIn PDF document text
    • http://counterman.ru/medical_imaging_physics_coursevotw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_601d96e913f86.pdfIn PDF document text
    • http://exampl1214.com/automatic_wallpaper_changer_appx3smk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_4fcc2f616e234cad99bfda53a247ce13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed99abe-9aa8-4ad4-b383-16b5f15c503d/wings_of_fire_roblox_wiki_icewings.pdfIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_7ac2e147c588406b86505f36b4d7a8be.pdf?index=trueIn PDF document text
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_5a48b8b7529a4a099282eef8b39583f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9671e132-8a69-4a1f-859e-d1523c216916/66379690175.pdfIn PDF document text
    • http://fizopifiluja.epizy.com/44763585612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abeaa7d4-688d-4f6f-861e-1125305555ec/how_to_properly_care_and_feed_your_husband.pdfIn PDF document text
    • http://vutimeban.rf.gd/spotify_music_for_offline_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a740b654-86e9-4406-9424-9283874d0f04/96805348422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef16003-bd8e-4c19-b0df-af920967e88c/lebedejewojugukatovo.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_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 5820 bytes
SHA-256: 86881cccdb09219009d643d403892c28023be5ed53e47993cda0b2dc168139f7
font_01_sfnt_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 11788 bytes
SHA-256: ca29287f57c0fb7baad87592f82f58f9720145441060062adfc2480cae0c21b4