Malicious PDF — malware analysis report

Static analysis result for SHA-256 4725d289148c0db7…

MALICIOUS

PDF

98.5 KB Created: 2021-03-03 18:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: eedbad10d2802035234bd447f9e49973 SHA-1: 83940bedbaddd779cd22c886b1e6edaeab87edf8 SHA-256: 4725d289148c0db753f2e0bcb00dda0fafa16fd03d98a3e751889758e110c38e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://midufefew.ru/123?utm_term=the+secret+history+of+twin+peaks+a+novel', are likely used to redirect users to potentially harmful content or phishing sites.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/123?utm_term=the+secret+history+of+twin+peaks+a+novel PDF link annotation
    • https://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/reliranobokopez.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/C6IjdKV/60922535239.pdfIn PDF document text
    • http://muvezada.iblogger.org/unfailing_love_jw_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_6021fb4331a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_6027ee06ab6ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_6019dc5889f2f.pdfIn PDF document text
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/9537434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_603e183d4e795.pdfIn PDF document text
    • http://juwolopuga.66ghz.com/vegas_pro_free_16.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/hfLgige/mitagiduvorobevosofela.pdfIn PDF document text
    • https://sedivunoruset.weebly.com/uploads/1/3/4/8/134859312/gosawakul-bakilet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5fea192a67b63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lefivaselefen.rf.gd/gezaded.pdfIn PDF document text
    • http://lojupefiduk.epizy.com/abjection_kristeva.pdfIn PDF document text
    • http://maxafatuvapare.rf.gd/73912513772.pdfIn PDF document text
    • http://nerelikeg.epizy.com/comparing_numbers_worksheets_4th_grade.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_off00014579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14579 5372 bytes
SHA-256: 3ffc4450de4545ebd0fb9c2487dcdc6ef03d5983c2b0402cc9cdbf73a03c985f
font_01_sfnt_off000157dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DC 10800 bytes
SHA-256: a9e508d674f7d8e663d84ada6c4865885b1cf821b26957da823039013a833972

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