Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1b1d437228d6aa…

MALICIOUS

PDF

77.4 KB Created: 2021-04-04 00:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1666c2c832fc60dd10c1f98075276855 SHA-1: 985e20fb3c9064809a2a06fa182579511da5f192 SHA-256: fa1b1d437228d6aa8bb02bbf164e5950032759b2a312c57ca874c50fb4638c82
186 Risk Score

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+bad+is+sun+for+your+skin PDF link annotation
    • https://suxexekara.weebly.com/uploads/1/3/4/6/134635419/garewiwesupowirit.pdfIn PDF document text
    • http://sacredname.ru/tugufogabijibugowijifudhq4av.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/5057585.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/09a8984731f.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/nufep-wuzizab.pdfIn PDF document text
    • http://idealica-columbia.site/174635087940f1cc.pdfIn PDF document text
    • https://vidanametok.weebly.com/uploads/1/3/4/3/134318125/202e7a.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/8417648.pdfIn PDF document text
    • https://tutiwelureno.weebly.com/uploads/1/3/4/7/134714557/a7c14ca9d4d7.pdfIn PDF document text
    • https://xawoveramexu.weebly.com/uploads/1/3/4/0/134095940/jiserov-ruzitilixu-nugila.pdfIn PDF document text
    • http://amst-watch-v1.club/self_society_and_cultureqocsw.pdfIn PDF document text
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/c0c969dadb509c.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://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_b1c1e34dd2a348ccaad161268174921e.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_7f25c0caf0874f01aa41d5f12fa78b38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8885876e-d2e0-4d22-be7e-b5da057e73b0/zoniwalozujujakabibogoxu.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_0ed4d468aa3442c69cf24db6c5b2baf4.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_f25046a0f83c4756a697c8ff6a6ae32e.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_40578d39a3c3476b883c82d2d9d0f38e.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_ddf3b8f95a954bfcba8c95a7f89ceda0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85bb4a6a-ab37-464d-9a15-e0d41827728d/lenovo_g50-45_ram_upgrade.pdfIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_07ca298f2ebf4d578b65562bdaf3550d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cd4638-9be5-49e8-acf8-02f3a7488f38/turonogododore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d4e0b0-0cf2-47d7-8300-447e1d34de5b/65406797065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56991984-7ebe-4bab-848a-a3daec9de529/konujasuvuzemowutupeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 4912 bytes
SHA-256: 74527f19971096112cf6ac7167b89de5d28c565c47fe2d2205f6428dacf2f39d
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 11136 bytes
SHA-256: 116b5c12ed5fc764fe52e20f5af7f7a54a36c0b8a2796616160dc579836525a7
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3