Malicious PDF — malware analysis report

Static analysis result for SHA-256 606ea5fdf0bb5ae1…

MALICIOUS

PDF

75.8 KB Created: 2021-04-14 10:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0137c854e47eda996ce42848f8e79b66 SHA-1: 503cfc4dfb2dd142a4d7f2b6792edb2da86e3a89 SHA-256: 606ea5fdf0bb5ae134d34a932803505a18c116420ef51e8099787b7401a70a4b
186 Risk Score

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 0.9995

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://pelibifir.ru/strik?utm_term=how+to+put+up+a+clothesline+pole PDF link annotation
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/ropijesuwe.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/2074026.pdfIn PDF document text
    • https://jiwebatije.weebly.com/uploads/1/3/3/9/133997557/9215598.pdfIn PDF document text
    • https://tapegunufega.weebly.com/uploads/1/3/4/6/134649957/8f5c3ad5b5ab0.pdfIn PDF document text
    • http://jodazok.22web.org/11691500274.pdfIn PDF document text
    • https://mapadubedebo.weebly.com/uploads/1/3/6/0/136095435/kovivapo_lipopapemik.pdfIn PDF document text
    • https://kuwesitupimanu.weebly.com/uploads/1/3/4/0/134095951/pudukaluvusaxuk.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/5bb33d30-335d-4c15-9a18-c3abb6a2b0f7/25040581378.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/lalejenujogafuzidaluvesu.pdfIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_7f7d553fd47b496d9fe129330bf9eb8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9271e6dd-b53b-47ee-8720-4e5f47251589/54523699379.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_9a01d4c4d255400785ce89ead1ffefd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7a490a-6912-427c-9509-137df7b1f57a/16141079111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e988a9-10fa-4e65-81fb-593576f34572/bartok_mikrokosmos_volume_2.pdfIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_687e30338406410181ddbd4e2765e420.pdf?index=trueIn PDF document text
    • http://wusasozomumag.epizy.com/33933982551.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/blackmart_apk_apkpure.pdfIn PDF document text
    • http://wedagavuvux.epizy.com/jejofo.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/xuxanemabefefaforu.pdfIn PDF document text
    • http://vuvumotelikev.rf.gd/mimasodijemijazutogolo.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/gebikowubutila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e9af80-c1f9-4f50-893e-8486a0885619/history_of_philosophy_without_any_gaps_youtube.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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 4976 bytes
SHA-256: 2f140fec41e2ebd722b6d9b0676c7108c8bef4d9b6ad7209cb7dc14c0ef18bbb
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 11268 bytes
SHA-256: 36cf83275df8ec6cd25581c29249f36a8a4361686b2ae8fd2e37d6f56023ca11