Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6797afe3dbd296…

MALICIOUS

PDF

75.5 KB Created: 2021-02-11 12:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d5579d3bbfb029f6d12a3e14db1593eb SHA-1: 40d49c7f987a091e2c441393824ab4a67bb492f0 SHA-256: 7c6797afe3dbd296401ee4df11a03b9f165549c576f4c8791428230dc7fcae2c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=teach+me+how+to+dougie+lyrics+meaning PDF link annotation
    • http://gamedv.design/alexs_office_safe_codey0mwa.pdfIn PDF document text
    • https://teguvazotumeli.weebly.com/uploads/1/3/4/0/134041540/lexurixubu-girev-sukijija-zefenosefeb.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/eAcUnhb/12722773094.pdfIn PDF document text
    • http://naturagrush.space/zubidebiwasaldyg4.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/13687624b.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/ichahhg/honda_gx_engine_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/ieMia0u/kodak_color_control_patches_download.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/544ac17c9dc.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/p8zigig/57231102751.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/tu2jiie/matrix_bullet_time_game.pdfIn PDF document text
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/jowole.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/nitozirawedasis.pdfIn PDF document text
    • https://mulononar.weebly.com/uploads/1/3/5/9/135959518/xofajoganelosado.pdfIn PDF document text
    • http://baranaydin.org/oppa_doll_download_uptodown7vnkn.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/3892706.pdfIn PDF document text
    • http://life50it.pro/open_set_in_metric_space57sd6.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/lovomijelun/63881767984.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/airline_commander_hile_apk_1._0._7.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/monthly_event_calendar_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/enchanting_1-_300_guide_vanilla.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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 5496 bytes
SHA-256: 1a986c8e2ba70d2a04d6bb3f662a94c8b204bcc4dee36fa994c729abae1a3096
font_01_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 11588 bytes
SHA-256: ab3a323330df525867b0c2ae7b0756c3da7833639856fb944c0597c5e8ec83dd