Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dfdbcc1687290e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 11:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f89966537da9a524c9941f2cd9f91a67 SHA-1: db121f570bb996d36600e77861dc88ed6ba23913 SHA-256: c8dfdbcc1687290ec5ba9d98023a074efa319f88a17a9d8476b5a8a1e390f2e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The primary URL, "https://zajinet.ru/strik?utm_term=who+makes+black+and+decker+coffee+makers", is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=who+makes+black+and+decker+coffee+makers
    • https://static.s123-cdn-static.com/uploads/4451542/normal_5fe5281fc3dc4.pdf
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/jatulepi.pdf
    • https://cdn.sqhk.co/dijogiper/fhfbLjc/financial_times_logout.pdf
    • https://cdn.sqhk.co/kidurukazag/ajiXigt/latigo_coggi_vs_julio_cesar_chavez.pdf
    • https://wolagevujizerul.weebly.com/uploads/1/3/5/3/135316080/pijuwi_pimowi.pdf
    • https://cdn-cms.f-static.net/uploads/4455396/normal_60163e1200252.pdf
    • https://cdn.sqhk.co/bukevexej/VKhiWjh/my_airtel_offer_internet.pdf
    • https://cdn.sqhk.co/sudizatase/cha6ujc/52374413395.pdf
    • https://cdn.sqhk.co/balekunu/bryYggg/suzufenudoroviselogexez.pdf
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/pivipurofugizejunuk.pdf
    • https://cdn-cms.f-static.net/uploads/4462982/normal_602abbad6f0bf.pdf
    • http://xabofawowu.22web.org/how_to_start_bitcoin_trading_in_philippines.pdf
    • https://cdn.sqhk.co/xevezele/AQiibjg/17590775766.pdf
    • https://cdn.sqhk.co/tokexinolelu/ibSieY5/math_literacy_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_7b66ef5a67064b869f0f1b3958db28e5.pdf?index=true
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_6e7f2c03d83343b193ed7d773f3beb0f.pdf?index=true
    • http://vixabewe.rf.gd/distance_on_coordinate_plane_worksheet_6th_grade.pdf
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_707990fff9e74592b59d08fd939a22ee.pdf?index=true
    • http://tusewareja.epizy.com/3934269958.pdf
    • http://jexititojule.rf.gd/xifawufoziw.pdf
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_2d099fc38f6e4168b5477f97137b28f4.pdf?index=true
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_c03adb6956534bbabe96e67634656278.pdf?index=true
    • 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_off0000e75f.bin
f03075b0696939e2c2473e01459a5229b17ad96afd7326a6e7ba22734695420d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 5476 bytes
font_01_sfnt_off0000f9da.bin
a7d3390784da770eb93e2194041b674b9120297337dde3e19d3b6f0249d05efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10828 bytes

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