Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55ab9a6479b1fbc…

MALICIOUS

PDF

77.1 KB Created: 2021-04-12 16:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a423f655ab980568b01cc46e0a33d337 SHA-1: 2e8a3685399d2ceb2f371ac924962454b98bb2db SHA-256: f55ab9a6479b1fbc82b7eb0f7738633d3e3eec8938fe6d22e4365d96e885cf7a
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 0.9997

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://jumiwimov.ru/strik?utm_term=why+doesn%2527t+my+heater+turn+on PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/BicRVpj/81516828854.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/midBDvp/odyssey_atlantis_dlc_episode_3.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/hbkjjhi/xedobafefovodewonibirof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_604b85094aaec.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/hafQdPf/pony_princess_academy_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_605b03a9ca1ad.pdfIn PDF document text
    • http://lakshmi-store.ru/terra_mystica_faction_selectionsbj3z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_6041cf34a5007.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/jjhatBe/marshalls_return_policy_different_store.pdfIn PDF document text
    • http://healthytrands.com/mixonuviravutabipubajud3sde9.pdfIn PDF document text
    • http://natojawu.22web.org/dofowibolodiwamabok.pdfIn PDF document text
    • http://felidefewipikig.22web.org/71155217710.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/how_to_change_belt_on_oreck_xl21.pdfIn PDF document text
    • http://xbet1.fun/481804332580i717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/284a6694-3772-4520-bacc-8a69b78fd944/what_is_a_american_dream_poem.pdfIn PDF document text
    • http://tafikepuvanotu.epizy.com/18247736834.pdfIn PDF document text
    • http://raxulifuroroga.epizy.com/mezeruxeretemokodi.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/business_english_lesson_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf935002-295f-40af-a461-b74cc30c068c/ubuntu_free_download_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38254d09-3b72-48a2-9d5a-38e30ceeba34/what_is_considered_food_waste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96671a12-5928-46a3-a93f-6ae090381e30/2430357973.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_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 5184 bytes
SHA-256: 0b658ad32b92c829a61098cebe5b62a6fecd77f3e98a53fd07fe02759d913c52
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 10752 bytes
SHA-256: 837b2a875846fdc6ed9dd7101ab0a3d9b28fc1e260d94d982e6293ecd9746bcc

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