Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6188e12a746341e…

MALICIOUS

PDF

74.7 KB Created: 2021-05-08 22:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6043b5f240e24e15bf2ce9f5bdeb330 SHA-1: 208e78f543d08df256e3af1b4522b58defb6762f SHA-256: c6188e12a746341e60ffb588e3f8e2957c3cd4f07854e6bee6c786c3fbfc048f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and one specifically linked to a search query about donating furniture. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable domains, and the ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs, particularly the one disguised as a search result, points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=where+can+i+donate+furniture+in+seattle PDF link annotation
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/1670592.pdfIn PDF document text
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/nezarezanawizu_fodip_bovijiz_wopotewaze.pdfIn PDF document text
    • http://brosbass.com/38645951214rzsr5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_60355eef952a4.pdfIn PDF document text
    • http://chunyoo.com/what_is_the_biggest_living_thing_evermzvek.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/bfc2904.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/ehgnihl/jumia_black_friday_2018_deals_on_phones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_5fd6471c1c398.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibowaxus/fibhdge/offroad_outlaws_money_glitch_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/zjfifv3/download_game_shooting_world_gun_fire_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_60431e3b50c39.pdfIn PDF document text
    • http://bu-markett.com/95630736464dh7aw.pdfIn PDF document text
    • http://webpost.pro/green_lantern_full_movie_download_innj7a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_605fd5ce27deb.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/f12aa8d5-7bf3-4f2b-a977-101a9ae25118/sunodutagoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db04652e-d19f-44bd-8cc9-5e2c55537175/30226780729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d47149-f217-4086-b24f-9bf7d4b80561/jupudevorutanemutaxopow.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_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 5124 bytes
SHA-256: 96fde57aa82e678885809eb93ce73afcebdeb71e729cde9c1cdc3747e209ee6f
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10236 bytes
SHA-256: aaabbc27b21b707f93c75a8b8c70bdda4646cd80f4d8f858f219d54559bb4783

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