Malicious PDF — malware analysis report

Static analysis result for SHA-256 df495d43bc185525…

MALICIOUS

PDF

73.7 KB Created: 2021-02-17 13:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e9d62154b4e2ce83d5f7189aeca72ed9 SHA-1: 2efd23aaeccc61e9cf63a8258231f2519ad18f6c SHA-256: df495d43bc185525c40ce6c2690e7ae40a756e8502f7930ea887197adacc7bcb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

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://jottigo.ru/strik?utm_term=sansa+m260+4gb+mp3+player PDF link annotation
    • https://jodalutuz.weebly.com/uploads/1/3/4/4/134444421/0929c51.pdfIn PDF document text
    • http://shoop-ff.ru/sofipiloxuka6784f.pdfIn PDF document text
    • http://biwifizad.iblogger.org/66807559331.pdfIn PDF document text
    • http://center-about.com/galaxy_milk_chocolate_bar_nutritional_informationn4oa4.pdfIn PDF document text
    • http://dalkomis.website/mekegodewewojetokunent8rl7.pdfIn PDF document text
    • http://zumikavu.22web.org/template_of_september_2019_calendar.pdfIn PDF document text
    • http://kieverts.xyz/baharo_phool_barsao_mera_mehboob_aaya_hai_song_download48qrm.pdfIn PDF document text
    • https://dopotixoniwatom.weebly.com/uploads/1/3/1/0/131070918/wumese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475196/normal_5fe5b0d4f303b.pdfIn PDF document text
    • http://temppicture.xyz/alphabet_espagnol_illustr17u99.pdfIn PDF document text
    • https://kuduxuke.weebly.com/uploads/1/3/5/3/135323303/gitisirokufovo-gadagalufifen-lofuxivagejitok.pdfIn PDF document text
    • http://vojutivuzijan.22web.org/92997781267.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunaraxanoxun.epizy.com/tikagukuber.pdfIn PDF document text
    • http://pavemadimakok.epizy.com/scag_tiger_cub_service_manual.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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 6164 bytes
SHA-256: 83e6bbe3f942cfba71cc654b6a9acf94a551860ba0fb4e62538210f1742c2f17
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 11044 bytes
SHA-256: a1c38cac7eceb99f435e8c74c8cb84e026d0a2cff600d0f39cb81a7ac496a98d

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