Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a174c41c103669…

MALICIOUS

PDF

119.0 KB Created: 2021-02-01 03:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b3c4a86b671b6a8cab67139233387291 SHA-1: 9c4a01c91e981dde32f0f281b4611efa9520b1f7 SHA-256: a0a174c41c103669f4bb933d7d3269f46322984146f47f5cc4788ec44080e19c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'note taking worksheet temperature and thermal energy answers'. The presence of malicious redirector links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=note+taking+worksheet+temperature+and+thermal+energy+answers In PDF document text
    • http://9gusevshop.website/maryland_form_505_instructions8fpzf.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/jeYD7jh/fufenavojafafekafasigarer.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/ccead4e198.pdfIn PDF document text
    • http://metazoaapc.fun/lion_s_pride_inn_sheet_musicn1hxo.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/OCFhiKk/kepamowunagipaguri.pdfIn PDF document text
    • http://helpcopyright-service.com/21418744754qts1z.pdfIn PDF document text
    • http://dalnoboyi.xyz/gokevabikebojopedelv031.pdfIn PDF document text
    • http://alkim.xyz/jabikewokamufa4ezqf.pdfIn PDF document text
    • https://cdn.sqhk.co/gumorefose/fhgiDOh/88387532236.pdfIn PDF document text
    • http://nesobaka3.xyz/kedovejulijelopubatotf7dp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fd2a1135c854.pdfIn PDF document text
    • http://prizinsta365.website/krunker_io_cheatsipsu3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416327/normal_5fcf270a82b9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/2274642144.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/practice_worksheet_graphing_quadratic_functions_answers.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_off00018f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F73 5600 bytes
SHA-256: 121ca0ae57f2763f05f796b9a97de975bb88a1a2049168fcbfdbbc9633612880
font_01_sfnt_off0001a278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A278 12756 bytes
SHA-256: 3468a0e2b03e932bcc436726e96817ad4c329afc217210a605b9acc280cdc6e6

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