Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfbf1e3082ac610…

MALICIOUS

PDF

79.4 KB Created: 2021-04-17 19:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cd6edc1831ddcdf1e6cf40013a091ab1 SHA-1: 560c412eaa9e593cdd2a359fe01cb1c546e81e18 SHA-256: 7cfbf1e3082ac610ff806800709d80c44dd2c076c544a0e0f0dd110db9bac815
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 0.9996

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://crophysi.ru/strik?utm_term=asp.net+mvc+dropdownlist+set+selected+item PDF link annotation
    • https://cdn.sqhk.co/baxorurifina/icPPek2/1946211975.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/yfzhgg9/find_my_friends_online_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/cjbThf6/ragufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5fd9a49932389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_605d4b7e57e49.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/d8ieJgg/vutisaruze.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/Y68iiGI/swatting_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/fic4Kgc/cancel_hallmark_movies_now_apple_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/fMhi038/sometimes_you_die_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_604dc16ed8681.pdfIn PDF document text
    • https://cdn.sqhk.co/pedajobu/vhgijt1/kazupelaxol.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/jfDlgdc/xewiradozolatofevapuf.pdfIn PDF document text
    • https://cdn.sqhk.co/bupusudiva/ifdPkje/mods_zombie_survival_apocalypse_map_minecraft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_602792a0f1b1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3557a179-a1ee-4801-a209-85ad6f504536.filesusr.com/ugd/9c409a_771ed292241a410ba1ef577cf58ca0ef.pdf?index=trueIn PDF document text
    • http://nefijojutofad.rf.gd/80402189990.pdfIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_6290699a53db4d3792844d04b9742841.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_1f458c5efd5740c1a19cec87f4705c94.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_6a651bd3600348db8daef659a071aab9.pdf?index=trueIn PDF document text
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_5e5a567209144f87928cc80660bf1c28.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_9ecd45301ba749dc88abae3e22d685e3.pdf?index=trueIn PDF document text
    • http://tofikelis.rf.gd/gumavidi.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_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 5184 bytes
SHA-256: 4fd8f16aea69294514021f0d06de995cafaa4b245302569a04927872097ff183
font_01_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 11316 bytes
SHA-256: d96584658ffe5709137de6c074852de79b6adea8f716b70027f53ad2272b89c3