Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8f89283c9518d3…

MALICIOUS

PDF

80.5 KB Created: 2021-04-06 03:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73213562c783ae3fa7b1a2ea981d368c SHA-1: 7dfdb11b51952ffd7104d1ac0f10afe9d022e69d SHA-256: 6d8f89283c9518d3b5f2a9a2d7e0ce26527fd3be8c3cb32c04c32f005a31bdca
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=netflix+earnings+report+q3+2019
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/xovope_wusidiwafimu.pdf
    • https://roxuxafuz.weebly.com/uploads/1/3/0/8/130813852/aac4a938aefb24.pdf
    • http://fogozuvonuw.66ghz.com/blues_for_mister_charlie_download.pdf
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/16b495952a.pdf
    • http://worabipupe.mypressonline.com/persuasive_speech_template.pdf
    • https://padudarudiloga.weebly.com/uploads/1/3/4/7/134714427/muloj_nusurawob_xegemokosasuti.pdf
    • https://wilibuluso.weebly.com/uploads/1/3/6/0/136086636/kitufezewurolaguk.pdf
    • http://lapivakop.getenjoyment.net/zewotidenuxupogidese.pdf
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/kufinasusupodu.pdf
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/3868935.pdf
    • http://fevinoreniwelik.sportsontheweb.net/kidde_fire_alarm_blinking_red.pdf
    • http://detozube.scienceontheweb.net/34418669614.pdf
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/b804e03a32.pdf
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/2852844.pdf
    • http://nesorus.mywebcommunity.org/23058515895.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zusaxadixuxot.myartsonline.com/davugefizasaminarer.pdf
    • http://xonelamurojili.rf.gd/coast_guard_female_weight_standards.pdf
    • http://zijedan.atwebpages.com/barabbas_book.pdf
    • http://dijuvunote.onlinewebshop.net/24997203013.pdf
    • http://zetesapoxus.epizy.com/twitter_apk4fun_history.pdf
    • http://susabumo.atwebpages.com/36967894115.pdf
    • http://xumozokuzutibuk.epizy.com/libudojetinu.pdf
    • http://fepusum.onlinewebshop.net/tusuwosojelawesufarul.pdf
    • http://pitalipe.epizy.com/diccionario_psicologico_completo.pdf
    • http://zukomakiduw.myartsonline.com/space_truss_details.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f870.bin
acd85ce4f6c3cfd1a1db1b92d11ab4e769acb9ba489ea7b27186715d4ee51a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 5880 bytes
font_01_sfnt_off00010c90.bin
b1929d6924a074cd6c9cc80c41fe72e657cccc7c9de69e793b8e15ccd0810923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 11304 bytes

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