Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8d58095e2ad250…

MALICIOUS

PDF

92.9 KB Created: 2021-04-23 21:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dd7adeef4003793f092289c2f8c7f49b SHA-1: 03e58c0591ce5bb4e5595c06b3880942066c4803 SHA-256: 4f8d58095e2ad250393121a2f5f1264b79a368ae4536837f2af27d009722570d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational downloads, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/strik?utm_term=english+grammar+book+for+class+1+pdf+free+download PDF link annotation
    • http://instapriz365.online/90039361046fu3qz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_606a4380e0b27.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/90581841073.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/wunozuxemovokisijexag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_6064e0a775608.pdfIn PDF document text
    • http://fruits-summer.fun/kesewijiganafu4z0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_604f8e71a49b8.pdfIn PDF document text
    • http://rebelliona.online/my_heat_pump_quit_workingoq66w.pdfIn PDF document text
    • http://forpost-electrica.ru/hamilton_beach_breakfast_sandwich_maker_reviewsovxlx.pdfIn PDF document text
    • http://kernig.online/luvemudalt181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5feb17e5e353f.pdfIn PDF document text
    • http://groshyk.site/237109299756ezv4.pdfIn PDF document text
    • http://save50.pro/shalom_aleichem_sheet_musicx9001.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/nozuligol.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/spinal_anesthesia_drugs.pdfIn PDF document text
    • http://abanca-electronica.com/2004_honda_odyssey_heater_fan_not_workingj8t2i.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://uploads.strikinglycdn.com/files/18291edc-e9b3-4573-aed7-33f755974441/where_is_the_thermal_fuse_located_on_a_whirlpool_duet_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0755d01b-e85b-4aba-98de-9a523f8663c7/kafebakukupa.pdfIn PDF document text
    • http://suxudogakol.myartsonline.com/36387614248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c09a282-21c7-4abf-9f0f-0a1495e34f35/google_image_search_api_android_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8d873b-539b-4f81-a314-ae1d563d397d/21425180573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c014e04c-e93b-41ee-bf74-8b0a063a3400/mimawel.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_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 5584 bytes
SHA-256: 60e4b852e016384f45cec38cb10466846470697e948f7023b0d6fc6ab60378fb
font_01_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 11504 bytes
SHA-256: 7561170512fab844003d38ed64ddbb93bdfb1db970e05fd52a9abb01af35c4da
font_02_sfnt_off000157a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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