Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f41dcd1f988d0dc…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 12:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 701c5474a9e51520d28bed9300f5f202 SHA-1: d9e1e96a60a97aa36cc61fcb9a912e548233af06 SHA-256: 2f41dcd1f988d0dc5e46352eda427e23df17d48791255b2b9b3f84f014c5b4a1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://golowaki.ru/award?keyword=app+store+submission+guidelines+pdf PDF link annotation
    • https://cdn.sqhk.co/vajirasavuz/fMdlii5/55549737288.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/hgfD0FR/nezaruzalosaxuvikez.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/eVhi62T/live_streaming_apps_for_lg_smart_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/ifgc1hf/matching_card_game_creator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_558920f91206401d89f268a301293fc7.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_51a1fe455314433b89dd669b42c992e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukara/iphone_stuck_in_guided_access_ios_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5180ce7-b03c-4b45-abec-87aa91ac8f6e/what_is_mechanical_wave_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f25eea-6657-4d85-9186-90170475a80d/22309908606.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/4407769868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0956e3c3-afc5-4fb9-ba70-5e49e02f8048/harry_potter_book_8_weebly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262e993d-093c-4544-aa68-d64a30a6caf3/79689434868.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/bejeweled_3_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1f14d7-f9dd-460a-a84e-ddad92e87c9a/cateye_wireless_bicycle_computer_with_cadence_and_heart_rate_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea89d76e-17c3-41cf-a9de-f3a3593e39ad/57835734445.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_2397ea2557b74ddd91ec8de4530b5bf6.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_692ac1f1ff3f4d99ac4a55aa8d4141ba.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_960a2908339545fd9187604cbf37cc0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/nibuzebuwiboma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0688dd6f-7c44-4e2f-b0e5-f6e1a60929ca/xovijaluraforeboleze.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/cytokines_in_inflammatory_bowel_disease.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56ea347-afd5-448d-8c5e-d4deba8374ab/valuvufanuripelumufisefot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd09381-64bd-4f22-a0b9-72a539ab1745/casio_mens_g-shock_solar_atomic_analog_digital_watch.pdfIn PDF document text
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_2120bfd424d64a54878c0445912c48ce.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_f3e0a7030eb6442380713e0449c3a229.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_f284b318cfbd4dde94d6b02534b9baa8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d484a2f0-3035-4d3c-b7b5-15a9371d0ed1/92297613333.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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 5280 bytes
SHA-256: 7196fa71960837dcfb194670e5ba67dba9b283f62e401dee8e415229b6d5ee0c
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10800 bytes
SHA-256: 6b667db7ca7d5f31021d3b8e9b0ee99f0262c15286b5560fb66a0559cd5d622c

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