Malicious PDF — malware analysis report

Static analysis result for SHA-256 341b416bd66f5464…

MALICIOUS

PDF

71.2 KB Created: 2021-01-22 05:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b37e7b6c645cc27079d92f7d07bb0c7d SHA-1: 7bea19b15d567446275bd240a131d9b6003f776d SHA-256: 341b416bd66f5464efb0bcf7831c57deca6f48aa30a22746c3130fbe24d1c62f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The embedded document body text, though heavily obfuscated, appears to be a lure related to a book download, likely intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=the+non+designers+design+book+3rd+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/mujexoxa/ivgjicH/nice_button_color_css_on_click.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fd3a0f141a4d.pdfIn PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/dusurumarukova_xodojimajaliv_mutexebiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455876/normal_5fc7a47f54d9d.pdfIn PDF document text
    • https://wazeketarawowaw.weebly.com/uploads/1/3/4/5/134587567/6978040.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/7jeLhgR/kuvanekuwiboxujopebavupif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fe077f504821.pdfIn PDF document text
    • https://niberijiv.weebly.com/uploads/1/3/4/0/134017170/zijejetirawegu-keremo.pdfIn PDF document text
    • https://wofovado.weebly.com/uploads/1/3/1/8/131871653/2874358.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/cJhbUgd/pizakoritepuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/bBdiifT/ritafolezexurubumag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482228/normal_5ff9ec8f1f254.pdfIn PDF document text
    • https://xuxasogunoniku.weebly.com/uploads/1/3/1/8/131856570/7117249.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/ejek8gf/44106285793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_5fe70bf2eed89.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/hfgiidb/delta_pilot_salary_glassdoor.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/hd3ii1p/76555099901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidazeze/76955577026.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/65796317168.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/66383927456.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/infinite_plane_simulator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/vce_player_2._4._2.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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 5380 bytes
SHA-256: 09afaf76ef6c5044ab6f338d6a8aa0d70a0ad950ba854363097a7203c5e6e24b
font_01_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 11964 bytes
SHA-256: 2e9ac582c47214b4a0481dbcc586348214c82205fbcf5c679b51cf80731b2b83