Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f56d3979c6f1f3…

MALICIOUS

PDF

80.5 KB Created: 2021-03-14 13:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 249ea85e1e95c9685119e99a3c2a53af SHA-1: 52f1751ac3e92087e9723fe1aa603ed7f1546612 SHA-256: 69f56d3979c6f1f37f61e9ea89d2ae400ee618ed32b02be85c903e887b472bba
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'nipisod.ru', which is part of a link farm hosted on disposable domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/wix?keyword=dealextreme+company+information PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480383/normal_603b5f7f77add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_5fdc2d69de367.pdfIn PDF document text
    • http://ulekschool.online/3d_max_for_macbook_freecw58i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_600e9360dfcbc.pdfIn PDF document text
    • http://e-devletodeme.net/fundamental_theorem_of_calculus_proofjmd7y.pdfIn PDF document text
    • http://tevfikyuce.xyz/why_dive_with_nitrox5ifc0.pdfIn PDF document text
    • http://it50disconto.pro/harry_potter_book_5_audiobook_jim_dalel53w2.pdfIn PDF document text
    • http://winfreeiphone.xyz/luvalafanoxavedexibv58e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_604699e1da8ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5fcc3a1be5d5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_b56add91f852420fbd45aa530705d316.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_4869cd7c38014a028fac514c979371ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe3fe91-6307-464d-8f76-35ac50c7d0a7/how_many_books_are_there_in_artemis_fowl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b14cf64-6e52-4d33-b9b8-a49814b5e765/what_is_the_point_of_morning_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d34241-5c2e-4380-bc6a-d5b10a77e110/lyrics_7_years_old_lukas.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_7cd686d1af934fe39f91918805e1abb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66663739-cb66-4aff-b2c5-81b9abec3532/murray_46_inch_riding_mower_drive_belt_diagram.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_6066bda280724b398fce62cd9b6b8abe.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_24ef1a3f44a445e99bb5ef6011cca421.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_e7e15d7f14504e69baef2f575d799749.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/walmart_near_me_pharmacy_number.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_452b34509d9b42d1b77dcf8f52ad1628.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/91622337466.pdfIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_420feb46a50149bcbf554cbe4213ef95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/mupedav.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_600430951b8341198a3d5f1098dab526.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/84577797097.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/aditya_kannada_movie_audio_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f390d9-b275-49c9-8aa2-72c820d290b8/o_que_eu_posso_fazer_para_engravidar_mais_rapido.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_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 5152 bytes
SHA-256: 132bf650abf02bb824954d119d4f42abc2b5eebbe7c6f85918b7ffdc284278b4
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 12788 bytes
SHA-256: b31127224c16ab6883ec782e5dcdac9bb9dc58fade86890bace5fc9da2801c72

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