Malicious PDF — malware analysis report

Static analysis result for SHA-256 0041f4644ca80833…

MALICIOUS

PDF

75.3 KB Created: 2021-04-09 16:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fd653791590a9768d0955b427cb98e6b SHA-1: c794c884108d7dc518b48db3d03adfd2a3b7ddcf SHA-256: 0041f4644ca80833afa45c633e5666e4e3c71c8dca81db3b0f5d5ffaf0875fa6
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URLs and the heuristic analysis of a link farm on disposable hosting suggest a phishing attempt to trick users into downloading a fake driver. The document body, though heavily obfuscated, contains references to printer drivers, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=hp+laserjet+1320+drivers+for+windows+10+32+bit PDF link annotation
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/4123638.pdfIn PDF document text
    • http://nakrutkavk.site/12823018313cdili.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://wanevowak.weebly.com/uploads/1/3/4/4/134465130/0a103885a8d9a52.pdfIn PDF document text
    • http://emirofficialzm.com/how_to_write_a_poetry_essayn4z5n.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/6ad5f8f78c75.pdfIn PDF document text
    • https://cdn.sqhk.co/zimamoko/99Nkgjl/space_invaders_spaceship.pdfIn PDF document text
    • http://vafefenovabire.22web.org/80027117910.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/hg4iIia/debakegepupojoviwajevilev.pdfIn PDF document text
    • https://zobagitolofoxaz.weebly.com/uploads/1/3/0/7/130739917/fijukakunelati_duxipu.pdfIn PDF document text
    • http://snegny.com/are_darren_and_dee_still_togethertz28k.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/eZjcYNE/match_attax_20_21_bundesliga_sammelkarten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvexarido.epizy.com/zuwiwo.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_6c6f2372622741cf8e310d2dd80d7a20.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_83e8edcfa56b47baa0628fdbf54a2e28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede2903a-e3da-4f67-8e7d-b50ae12787f7/predator_generator_reviews_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6af6882-d533-4940-82c7-2d2660eb5e5b/gopro_hero_3_black_edition_hard_reset.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_1dc44ea4e4564371ab747187008f4d4f.pdf?index=trueIn PDF document text
    • http://mewilibuze.epizy.com/98287838443.pdfIn PDF document text
    • http://jategemi.epizy.com/abdominal_compartment_syndrome_guidelines_2016.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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 5852 bytes
SHA-256: 2f71d00fd0f4a545790b3db9af6f62a3e7c9bb45d7cc9f54db19c051ad0d541a
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 10616 bytes
SHA-256: 35bc69378494ada828b22244e98f34117ae1ed128c85575662b579ef366bef6d

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