Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0896e69c25b77a4…

MALICIOUS

PDF

81.9 KB Created: 2021-02-27 23:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a01de48df0c40984c64c77abcdf5cdf3 SHA-1: b66f0c04bc735aa0493e87722a022005ea328500 SHA-256: a0896e69c25b77a4d3fa6c7b6d0b16e0b93920a4b5a0b0f20e086c8d82965eed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=what+is+the+best+technivorm+coffee+maker PDF link annotation
    • http://winoxolupuvil.getenjoyment.net/network_support_interview_questions_and_answers_for_l1_level.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_5fcac7c188918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_60282ec0a298b.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/KYgfjaq/matisijotinulixugejekowuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fe139206f62a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6023f1c05c5b7.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/ie8idrT/coastal_community_and_teachers_credit_union_payoff_number.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/fffe6504062.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/4fb0ccce9453b9.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/ajhM75e/somowekuboxinamimiluga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489975/normal_5fcbc7e7bf437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_60190980302ca.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/international_business_college_and_vet_tech_institute_fort_wayne.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/1gi78NY/seven_letters_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_5fd9b1d5abd4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/nice_asthma_guidelines_2019.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/how_to_describe_a_daisy_flower.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/11700024827.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_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 5156 bytes
SHA-256: 03c87f6b34cc0d39e50c47c435cc26b65082fbafa2baffcbb13c70dfd09e0cd4
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 10436 bytes
SHA-256: ead03117a4b7473b43dfc1845411dc4d90a28f8a9712801c2b8d7056942b56f6
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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