Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a13402947ba494…

MALICIOUS

PDF

76.9 KB Created: 2021-03-23 19:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 57eeaa97bc32105517db7f0c9b60cad0 SHA-1: dc5267daa1b72ded7e083b0bbe704a9373162e3f SHA-256: 41a13402947ba4943ae309a5274b818caceebeeb1e78fdfc9508e86725ef1ebb
192 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including critical detections for malicious redirector links and ML classification. The embedded URLs, particularly 'https://dafemum.ru/strik?utm_term=rioja+wine+match', indicate a phishing or malware distribution attempt. The presence of a 'Download Now' lure further supports a malicious intent to trick the user into interacting with the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=rioja+wine+match In PDF document text
    • http://votewimuvuxa.iblogger.org/english_to_bengali_dictionary_free_download_for_pc.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/18670672542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_6028772f18d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fe73f3341f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601b30f36e774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_60520c03d59d9.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/ecology_lecture_notes.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/zujetelitokokisunedip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475985/normal_5fce7b0b33bc4.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/1870936.pdfIn PDF document text
    • https://samojajakab.weebly.com/uploads/1/3/4/6/134696950/29cf8e2b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejefovad.epizy.com/celliant_sheets_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/434586785.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/37399427951.pdfIn PDF document text
    • http://pixutuvaw.rf.gd/59451346444.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/intermediate_microeconomics_with_calculus_download.pdfIn PDF document text
    • http://mebubilatenizef.epizy.com/dikoribakejenunazu.pdfIn PDF document text
    • http://pidawuz.epizy.com/instagram_for_mac_air.pdfIn PDF document text
    • http://zopimubusa.rf.gd/jugexuxuzabivewunudasedib.pdfIn PDF document text
    • http://gijuvaginitawaz.epizy.com/77623385216.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_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 4908 bytes
SHA-256: c7f94151b3f412736419850d05115e270c6185bbff53aba232f28fdf09626967
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 11704 bytes
SHA-256: b038296d664fc478113d35890e9dbfdb8b9b8b4ed61a3121458776ec90e898ee

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