Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e285e6100e8899…

MALICIOUS

PDF

75.1 KB Created: 2021-05-19 04:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3dcb2cf6a756ea3c1fa5b57163810838 SHA-1: 7c9326a0dd1d1b7b61a6b8cbdbea53cb1961a678 SHA-256: b3e285e6100e88993bf997e9afcc10dcc51397d93aed1dc55c07ca907cb20bd5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent. The ML classifier and ClamAV detection further support the malicious classification, suggesting the document's primary purpose is phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=what+are+the+advantages+and+disadvantages+of+contingency+theory PDF link annotation
    • https://dozevexenunapaf.weebly.com/uploads/1/3/4/0/134017655/6379956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_606c367a7577b.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/4376743.pdfIn PDF document text
    • http://jafujofefi.iblogger.org/psychological_safety_in_the_workplace_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_6025f9f5d764d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368760/normal_5feb0b03ac28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_60257b4301998.pdfIn PDF document text
    • https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/c1f8a99ddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459062/normal_5ff194da4944c.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/0c11a64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5fe7e5b93390d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387424/normal_5fdd028c06b10.pdfIn PDF document text
    • http://bufaturofonoko.22web.org/asepsie_antisepsie.pdfIn PDF document text
    • https://ritiburup.weebly.com/uploads/1/3/0/8/130814353/nofoxuvek-xolosisi-gelixa.pdfIn PDF document text
    • http://xexegojadesuti.22web.org/nipijuvorejoduvopem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukorokibenej.epizy.com/do_you_have_to_pay_for_a_covid_test_in_canada.pdfIn PDF document text
    • http://womilebejip.rf.gd/31206077099.pdfIn PDF document text
    • http://jigujirew.epizy.com/girutinoxipatalegukuzo.pdfIn PDF document text
    • http://bikaxubu.rf.gd/rowdy_baby_hd_video_free.pdfIn PDF document text
    • http://koxaxoboxuzir.epizy.com/how_to_bypass_parking_brake_for_dvd_player.pdfIn PDF document text
    • http://dapomajaberi.epizy.com/46134818492.pdfIn PDF document text
    • http://gepikadagutuv.epizy.com/nefepifululifisegatujumud.pdfIn PDF document text
    • http://zunedolu.rf.gd/rorizufuga.pdfIn PDF document text
    • http://pekijokedod.rf.gd/how_to_start_a_senior_farewell_speech_sample.pdfIn PDF document text
    • http://telatojewoka.epizy.com/32335714895.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 5428 bytes
SHA-256: b852a8f7b412cf25504557bb13e4fea627af093168ea8e3bcf3fd638dd9d6696
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 10468 bytes
SHA-256: dde32a92055a55f8f3a15dcd6244c3d9e47abe499afa93bc3395f8f20c2d4cfc

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