Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8adf1a8edc3f1a7…

MALICIOUS

PDF

73.5 KB Created: 2021-06-08 21:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 42394d21147b88766ebff07e77024a4c SHA-1: ac2d10c86c6f132aede0ff54eb76db8d7d082a6e SHA-256: e8adf1a8edc3f1a7aa3da358c936f800b784f84773a2fb7002d41409959d2fae
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 0.9996

Heuristics 5

  • 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 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://nomylo.ru/pbw?utm_term=system+design+in+system+analysis+and+design PDF link annotation
    • https://xujarilo.weebly.com/uploads/1/3/4/6/134693127/9199156.pdfIn PDF document text
    • https://sidufuzijek.weebly.com/uploads/1/3/4/5/134598689/sizaxoganuja-nidapaxux-nabirivefaw-pedewaj.pdfIn PDF document text
    • https://vabikepopuf.weebly.com/uploads/1/3/2/3/132303012/rokugatuvu-suriviwowuvuwik-xeruduvowivaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426260/normal_5ff94168dd5c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5ff2563de5c19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446642/normal_5ffb6014d4626.pdfIn PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/jefetiropapidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_6061fa1156051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_60b992c250bc0.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/xaregazuxaxamegam.pdfIn PDF document text
    • https://nosodawef.weebly.com/uploads/1/3/4/6/134693330/zunufega_jusud_fazuwanusosewe_lubax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409257/normal_5fe0e17a1d09c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_6020aa472d011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_60344dfecbf94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd1733c-839b-4129-9759-5bbc701c5618/bojepivojubapoditovapaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15778ca0-5615-4b67-9246-061a3cdcddc0/school_uniform_argumentative_essay_example.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144424191/how_to_emcee_a_7th_birthday_party.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b1f408-ed98-4652-823c-3f3a7d1cd591/purijiromo.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144621777/what_are_the_3_different_reading_techniques.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/vijikudubalewoxajanide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f176a4-5ebf-48f2-b406-3cadff090bb2/87780541703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb7c763-676e-48e5-80ba-668c6c8be81b/network_security_specialist_salary_australia.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_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 5252 bytes
SHA-256: bb529350aab93643f50d86b7588f9eecdea71fdbbf63bae1615aae259396e286
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 10308 bytes
SHA-256: bca8c4444c8380aea9e33d07b330d42ade1d1c012064cd1bc9c6158cf4f3eee9

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