Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f606135773c4d53…

MALICIOUS

PDF

72.3 KB Created: 2021-03-18 08:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2c0a9ba68e553755d50eab99aa60fe71 SHA-1: 9edab8ad9a310ce22eddbd245175542dac6564c5 SHA-256: 1f606135773c4d53155a33168cae3af2648670244560b7b16bfcda85fa8ae6f4
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a potential lure related to interview preparation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=15+minutes+to+a+better+interview+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ffe1c24dcb9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_604330ac62397.pdfIn PDF document text
    • http://hdsamara.ru/sap_bpc_training_guidem1a4q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fe90ff5aaf53.pdfIn PDF document text
    • http://quickpapp.online/kitanexafubaxanimermdl.pdfIn PDF document text
    • http://prodson.fun/2284312991nmggy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_6043fbf941110.pdfIn PDF document text
    • http://tokio-2020.fun/gujarat_samachar_newspaper_ahmedabadq6sx5.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/exam_questions_and_answers_entrepreneurship.pdfIn PDF document text
    • http://custits.space/lezanixevagirowakoruwotxjxkt.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/52720051788.pdfIn PDF document text
    • http://mexicotop.xyz/is_organic_chemistry_2_required_for_pa_schoolzer18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5fc6665c9c4ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_600883d964576.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/nuxulikiwab/11842660517.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/troy_bilt_weed_eater_2_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/63434637891.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_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 5528 bytes
SHA-256: 6097e39594cc8fca323bf335a7e7dc5f744b806d5bb2bd69f0c4a673f4a191c1
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10416 bytes
SHA-256: d305840d59dcc71a2bbef4e78b409c52c678df0f33ca1fdfe7b339035a052171

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