Malicious PDF — malware analysis report

Static analysis result for SHA-256 1422efe85621d30a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 07:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0824b563783efcf0a169b8fd9fc2db1b SHA-1: eacbe0d808bc81de04358d7f5c5a5fba50354434 SHA-256: 1422efe85621d30a0653e56594cb7559374546eac5399496eef4af48229d891c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dijitalsanat.link/upload/files/21393801964.pdf In PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jesigapamosogos.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/55026202720.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/nidetupukusudo.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/vavapobupenilanoxuvolak.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/49880591568.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/41650926194.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/xiripaselukekujapaje.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/68917378337.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/tidukerugisufomoken.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/kenubutonefedo.pdfIn PDF document text
    • http://surtek.biz/image/files/20150319_031814.pdfIn PDF document text
    • http://flomojapan.com/upload/files/26577532618.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339b070313a---47617818276.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/83085120232.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/jemofuzenuzakubaze.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/derizemosus.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/35529020255.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/22458244444.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/fubavi.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/dafugapanimij.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/60865706862.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc98b505d---95611846262.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/94102252328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+mp3+music+download+app+for+pc+windows+10PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 18064 bytes
SHA-256: ad21aad7ec7a5588f5ab5ed55a818cff8a5608c301ae48c19893f672ef2e1294
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 11192 bytes
SHA-256: f4888e9b533f4e9fb0171c5efe16e317047d45127565b2310d68265dbfae2f01
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1