Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d65dc4544615b20…

MALICIOUS

PDF

77.6 KB Created: 2021-03-12 01:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9001e66065ff03995f5abb8a9d4d64c6 SHA-1: ef47e2278d2efa7395e2f56595325efc89f31ee8 SHA-256: 4d65dc4544615b206c83084e5b28020dbc1212915045e7446ded2f32eff670f6
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. One of the primary URLs extracted is 'https://jumiwimov.ru/wix?keyword=mercury+thruster+trolling+motor+manual', which is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/wix?keyword=mercury+thruster+trolling+motor+manual PDF link annotation
    • http://zevewidojodot.mywebcommunity.org/nakokox.pdfIn PDF document text
    • https://cdn.sqhk.co/xegigujatefa/ljgy6hg/red_sunflowers_meaning.pdfIn PDF document text
    • http://zipezaronin.iblogger.org/young_sheldon_episode_guide_air_dates.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/huRuijJ/edpuzzle_student_login_code.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/e44jeih/the_7th_guest_remastered.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/jbFCiT2/cnc_pilot_4290_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/uZhdDpt/67905821565.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/hgjcDyO/66842491750.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/4754747668.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/nyhe3gg/5012073445.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/hhjggih/7907880639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6581353-0c91-4152-8d15-b324fb4b32b0/petsafe_rechargeable_collar_not_working.pdfIn PDF document text
    • http://laxaguwen.epizy.com/60544625132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408d4697-6981-44f5-9167-720a94458053/how_much_is_max_lucado_worth.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_772d0747844942909980bcf575566a22.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_e447c553e2a7494e902d88818864acab.pdf?index=trueIn PDF document text
    • http://xifebudi.epizy.com/rj45_crimping_guide.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_80c8d776ffe945a386bd47f9e2b23991.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f8925d-f4b5-4be1-9305-6b7d88ea6d7d/57773582544.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_669b01a357e3422ca59fcc020319c725.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/593ed85f-4353-4375-9829-0a2e015db315/mololudomutuvitoliwewa.pdfIn PDF document text
    • http://wikugojumoxo.epizy.com/arizona_dream_soundtrack.pdfIn PDF document text
    • http://fovemotalulefil.rf.gd/45965651656.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_7c6241416cec4eee8fdb7142f9c930ac.pdf?index=trueIn 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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 5320 bytes
SHA-256: f055dfc012b618cc08d62160676a7556cfa36c615867769454406533ca511a21
font_01_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 11000 bytes
SHA-256: ba7194a141093e482e15ab3121136b5440c1dc0bd3a8ae9d19a1c61e61784aef