Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2cb7113de57d79…

MALICIOUS

PDF

75.5 KB Created: 2021-03-16 07:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef030d4bd7f7f96a45f4b6e526091598 SHA-1: 56bf10e445ba9095be927cdad80dc2df62dfc286 SHA-256: fc2cb7113de57d79b079bfae74c6af83cf84ae82186c63381019bd1539bdf156
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/strik?utm_term=advanced+sql+textbook PDF link annotation
    • http://punejew.mygamesonline.org/kixijorubulidot.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hAKeW2W/mojutinenuxagokiragizalan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_602732f3d18d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fe04916b344c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_60345c2bafbb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464319/normal_602ab64e8d628.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/jjizzLf/fudewokazenupivozipap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_601b609d2bf84.pdfIn PDF document text
    • http://tupakewufitid.iblogger.org/ditty_bag_girl_guides.pdfIn PDF document text
    • http://retakajuzupix.22web.org/2360039452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_604d3d444e31e.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/76625555573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_5fc907fc049e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_60110c83071aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450140/normal_5fc87b8d78712.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/cEpmeTg/hebrew_new_testament_audio_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowakimelufumi.epizy.com/plantronics_backbeat_fit_2100_reset.pdfIn PDF document text
    • http://gitodake.myartsonline.com/wopumovabofexi.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_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 5284 bytes
SHA-256: 23c82c34dd71480ee2ef4181e30e1920483d233347ca3f488375d04edd31114f
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 10352 bytes
SHA-256: f7888ea778ab843db0b4ba0deb41160527c98c90ceabd8aa72b91ce20332e3a0

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