Malicious PDF — malware analysis report

Static analysis result for SHA-256 334e4fd70bb14acd…

MALICIOUS

PDF

73.6 KB Created: 2021-03-09 16:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 40d06c162f21cac91c91adda4fb7f514 SHA-1: c0a0869438b49f8dd78892254b0b12269dbc885d SHA-256: 334e4fd70bb14acd7b93ddd23246578ab443561aafe957c4222567c221442cfc
126 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 of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily corrupted, contains fragments suggesting a lure related to 'free vpn proxy apkpure', aligning with the external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=free+vpn+proxy+apkpure PDF link annotation
    • http://mitutazulew.22web.org/41479336828.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/how_many_red_non_face_cards_in_a_deck.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/matricom_g-box_q2_setup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maguzuj.rf.gd/zaxojipometutewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d505d8f-ee1e-4245-bc65-3a0d5574e927/best_stocks_to_invest_in_2021_long_term.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_472b3769ccf043e591a99a69fadd2438.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/publix_pineapple_chunks_nutrition_information.pdfIn PDF document text
    • http://gevewodex.epizy.com/35967913294.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/drunk_parents_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc60650-1902-408e-ac2c-1788a551545a/for_dummies_book_publisher.pdfIn PDF document text
    • http://zilemugas.epizy.com/report_immigration_crime_uk_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83195e4e-42a7-46ca-b70a-ea348f72b839/movurejozezat.pdfIn PDF document text
    • http://nunoxemimo.rf.gd/the_timeless_way_of_building_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/android_apps_on_linux_mint_18.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/math_facts_computer_games.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_b2cb33e7c70a446aaa62c3777e3d95c7.pdf?index=trueIn PDF document text
    • http://pitugozuput.epizy.com/47041074996.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 4852 bytes
SHA-256: 696fa77f368b11ca9730b607d1149e3e8539f066d8d4324f172a0bfb28f78c66
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 10440 bytes
SHA-256: c259084f4b689745a65db07013227f17951b74143eea3c3afc3b9901692fac80

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