Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe435d71f93efea…

MALICIOUS

PDF

110.8 KB Created: 2021-02-19 12:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 90d7d73b0bfd7e3f3b05ef06108735ac SHA-1: 171d2ff0c18b834086171a4ba08cd1a34679aa31 SHA-256: cbe435d71f93efead0648e6cf75e71314e02cb3f6a702b19655f3a781756fc2e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://leonvi.ru/123?utm_term=writing+idiomatic+python+t%25C3%25BCrk%25C3%25A7e PDF link annotation
    • https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/xariku-vopafu-nexiloz.pdfIn PDF document text
    • http://bettermoneytips.com/98724703220xhzdj.pdfIn PDF document text
    • http://hookup153.online/easy_ukulele_songs_for_beginnersmpu9m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371020/normal_5ff4b3c3add19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fdf71aceb63b.pdfIn PDF document text
    • http://docita.fun/ac_nl_save_managerwjghn.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/e6307c83d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423189/normal_5ff66267a96ec.pdfIn PDF document text
    • http://vovadot.22web.org/sweatcoin_hack_mod_apk.pdfIn PDF document text
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/1937157.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/a91fbac0208e.pdfIn PDF document text
    • https://nujazovarurep.weebly.com/uploads/1/3/1/8/131856890/820a7794c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fc949e480c4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384480/normal_6003b2b0d50b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juzatapanosuwi.rf.gd/cara_membuat_google_form_tanpa_login.pdfIn PDF document text
    • http://famosubapaji.epizy.com/2014_chevy_traverse_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B5 2948 bytes
SHA-256: ce96b12e9915ae00788165bdc898c8313e64b942c5fb2cd6e51536d4bdd2f265
font_01_sfnt_off00016b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3A 5760 bytes
SHA-256: 6e64e8a69047c215e5502474a47077c0d17714599775764c047ff899042a5275
font_02_sfnt_off00017e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3C 16032 bytes
SHA-256: 8cd0458c98b2d2e1ab1267bab65a0bd3856d4456de85199df060a221a0b8614f

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