Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0de803d0a617405…

MALICIOUS

PDF

77.5 KB Created: 2021-04-23 17:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d91bd5a190f1dcd759f31386df3b205c SHA-1: 9f9bb6e7ecf9c6ce1cfad83a164913d4af50d9ab SHA-256: a0de803d0a617405a642f4fe9c98bbd06e04028a274cc125ef107a1324610cf3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://lozipotod.ru/strik?utm_term=first+amendment+essay+outline PDF link annotation
    • http://dupovim.iblogger.org/minerales_alimenticios.pdfIn PDF document text
    • http://keepsufi.space/commercial_cool_air_conditioner_10000_btus1ac1.pdfIn PDF document text
    • http://takudogifox.22web.org/download_to_word_converter_for_windows_10_64_bit.pdfIn PDF document text
    • http://godevibusaxinoj.22web.org/vonusulubupevivumopemu.pdfIn PDF document text
    • http://clubstore.info/136081678408pwj4.pdfIn PDF document text
    • http://pedalini.club/82976592350yg75b.pdfIn PDF document text
    • http://begetus11ppz.xyz/zovilamomojepijiromabuolyr1.pdfIn PDF document text
    • http://chtotakoebezuz.biz/8131165959445vbo.pdfIn PDF document text
    • http://neridipazaf.22web.org/70156359981.pdfIn PDF document text
    • http://coolvdomaion.online/libisimujujumadarudg07q.pdfIn PDF document text
    • http://about-igsupport.com/how_to_make_dark_brown_colour_by_mixing_two_colours0lhrr.pdfIn PDF document text
    • http://dress-russia.ru/how_to_fix_schlage_keypad_deadbolt9vjc5.pdfIn PDF document text
    • http://winwites.space/79381909610gtny.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_fb60f4eff2d54d82beb2aae8eaec3893.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9282529b-5b29-4ca9-ad38-316b911c099d/gomos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144c0b09-4409-45d0-a313-bbbd597945e3/wezorewipolod.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_3d8c779e54dd4e1880000c5ec4400dbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca8613c-26ed-4161-8af2-6170da05c5f9/gegodigemogomen.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_5ac33e8a0f024a2b8b8eabd055746126.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_7bb01c3061e54e84bf4e01f00f4ee6d0.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_e2512593123e490a99183c19187ce6f2.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_8ae498ccb8444fd6ad75b61ff3827c65.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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5028 bytes
SHA-256: f4075376ef1e1ec99385647e2bd1da0ce5e05a5883186f356bd92bb4c1399303
font_01_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 11040 bytes
SHA-256: a9979b2a6cc48733e5975b0e6f8501b3aa4120e14568653a9303fa14612c8661

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