Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4dc81256e54f5b…

MALICIOUS

PDF

64.0 KB Created: 2021-03-07 10:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 497561720ad02ee8f4df093f3c0fcc4b SHA-1: 0a97eb60a30d9d2d41a0d8921e51a6ce8be9c141 SHA-256: fa4dc81256e54f5b1682da649fc2c5f6ea4f89751c34389ca94f2a0e3080204d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9896

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 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
  • 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://maypoin.ru/award?keyword=diesel+electronic+fuel+injection+system+pdf PDF link annotation
    • http://zodelem.mygamesonline.org/bomuwolugewiwezuvof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419002/normal_6002441f4ab57.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/b34b4fb4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_603cb918e6a8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_5fdb2441aa70f.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/jezoraz.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/91796497540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_60345d6d4d72c.pdfIn PDF document text
    • http://sirosin.iblogger.org/the_hiding_place_cj_tudor_ending_explained.pdfIn PDF document text
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/47cbcbf2d.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/a6ff4f31-e9ff-4e78-bf73-f8db4494fd00/al_quran_al_kareem_uthmani_rasmussen.pdfIn PDF document text
    • http://jewikotadukusug.rf.gd/garmin_vivofit_jr_2_spider_man_black.pdfIn PDF document text
    • http://nisebot.epizy.com/lurazozizim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/664694cf-7ff3-4e50-b29c-143c26845ba8/89909458865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468618fd-26f4-4434-924d-a910a26cc578/what_is_curriculum_development_model.pdfIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/83447540092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad18c213-be85-47c3-a7e1-cf81034ea2d2/sasajojegofewawifurubu.pdfIn PDF document text
    • http://jinixoxugud.rf.gd/19350237629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0bd2f3a-3485-4c80-be89-5857d06cee0b/vologav.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5268 bytes
SHA-256: 39b6d865d7f86aa8c62d63ded001eb612bced0aedb779a9f66c713906eb14187

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