Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd4391bbabcae27…

MALICIOUS

PDF

74.6 KB Created: 2021-02-27 11:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 80b7edc08ff505b5e68b4a466298f691 SHA-1: 4a20b688aadd90b928cf6c45b7deb946f684391e SHA-256: 1bd4391bbabcae27906d69da9bab57ee0c272a781365f6484c18f3b6c9f632cb
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a malicious link farm, containing a large number of external links to potentially malicious content. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to phishing or malware hosting sites, aligning with spearphishing attachment tactics.

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 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://golowaki.ru/wix?keyword=rs3+obliteration+vs+nox+staff PDF link annotation
    • http://ruguwafe.scienceontheweb.net/good_night_gorilla_story.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/UQifqse/mastercrafters_clock_and_radio_company.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/a398ef5d.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/a3b96.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/4d969757.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/gexJvE6/kart_racing_suit.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/16256387680.pdfIn PDF document text
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/luvukalovopuziburu.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/rawigukug-zobosuwesero-watixewesesenu.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/422a26.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/best_programming_books_for_beginners_reddit.pdfIn PDF document text
    • https://getesedalo.weebly.com/uploads/1/3/4/6/134629657/3e2625d00f.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/dhR90gf/combat_flight_simulator_4_telecharger.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/8459820.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/yihhajc/juvonazupazolurid.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/icjhhav/rise_of_kingdoms_gift_code_september_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warunegiluj.rf.gd/14291844063.pdfIn PDF document text
    • http://lilepav.rf.gd/nakitejawixovugugowobak.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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 5200 bytes
SHA-256: 9e2c5bea646269b774a0cfe6c16caaf07f34cb157d82ee7862a20149d1bd1d60
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10472 bytes
SHA-256: 0669905ed93714dc0ed1b7fd90bcf95838cb6157377d70626f9dd71aa4e25bef

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