Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2cd24b41ef4837…

MALICIOUS

PDF

93.2 KB Created: 2021-04-07 20:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3a1ebb64d7ec9f4d5bd7e02554c9cd6b SHA-1: f4ed1d22fcce4244d18b277326686fb0522f6580 SHA-256: 4f2cd24b41ef483770a65940c3bc92d9426f54750e6bd73ea42ee795dab474db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of external URIs and a link farm on disposable hosting suggests a phishing or malware distribution scheme. The document body, though partially corrupted, contains elements that could be part of a lure, and the 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea of a deceptive download prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/aws?utm_term=double+dapple+dachshund+for+adoption PDF link annotation
    • https://cdn.sqhk.co/mivesumor/Jhj05FD/jugifugejakisukexotalobod.pdfIn PDF document text
    • http://roxopazin.iblogger.org/rirumuvodobudideweberu.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/haaifrZ/servers_for_mcpe_1._12.pdfIn PDF document text
    • https://cdn.sqhk.co/lefuwaregew/gfhh4id/5066029229.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/tulewuzodejewo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_68e2a5dff122466095a0f5bc34a88e94.pdf?index=trueIn PDF document text
    • http://fiforeru.atwebpages.com/learn_arabic_for_kids.pdfIn PDF document text
    • http://zupamifub.rf.gd/how_can_we_abolish_the_federal_reserve.pdfIn PDF document text
    • http://gelopet.epizy.com/lujewuxovelew.pdfIn PDF document text
    • https://165b0ab0-89c3-4517-b88f-e2bd0c55d975.filesusr.com/ugd/97b555_c917d20be6c542adb399692aaa59b777.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_55bfcde8a7a54a7aa983a210b03c1c66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/formatos_que_lee_kindle_epub.pdfIn PDF document text
    • http://lipaxunuvevi.epizy.com/app_store_location_el_capitan.pdfIn PDF document text
    • http://dopelatov.epizy.com/21930822423.pdfIn PDF document text
    • http://zigozojifipo.epizy.com/31215547667.pdfIn PDF document text
    • http://lolunoxij.myartsonline.com/az_100_dumps_free.pdfIn PDF document text
    • http://jizonizop.rf.gd/kaspersky_antivirus_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/37574177395.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 5392 bytes
SHA-256: 6fa2e6393e6ce0addb63054a2c5770b08db3d5fb7ab64c269c5744f6e75174f1
font_01_sfnt_off00012e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 5384 bytes
SHA-256: 5a422325229ff5c7f505849e52ba48fbf2465e344468ab22ffadabbf006a667e
font_02_sfnt_off000140bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BD 11336 bytes
SHA-256: 94cf9159e6fd9235a2654d14b82841e5ade4690ee5515bda31df9a00c0cdea17

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