Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0e25ee592717b0…

MALICIOUS

PDF

87.6 KB Created: 2021-05-13 14:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6fba14bd205ecb0afecb6fe07eb933ac SHA-1: 2605863eb7221593f1d0673753a6ee1c52e709c8 SHA-256: 6c0e25ee592717b093546a3bf577958fdf1f640ac7db1a47060f752dff1f0eec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and contains junk data, but the presence of external URLs is the primary indicator of its function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/strik?utm_term=is+haier+ac+a+good+brand PDF link annotation
    • http://lojisaka.22web.org/29750804901.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/ddbb0c85956b8c6.pdfIn PDF document text
    • https://kaferafodi.weebly.com/uploads/1/3/0/7/130775544/ff3eb63695ce9.pdfIn PDF document text
    • http://vukefof.22web.org/42111062491.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/jdXcjdA/best_deals_on_ipads_right_now.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/j44hKWw/movie_edit_pro_free_download.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/kedakol.pdfIn PDF document text
    • https://cdn.sqhk.co/farovufu/Obq2ggE/township_tale_backpack.pdfIn PDF document text
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/jexuvurojodakoler.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/cggibhc/fire_wallpaper_hd_iphone_xr.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/igwn6id/imo_free_video_calls_and_chat_app_download.pdfIn PDF document text
    • https://fenanasu.weebly.com/uploads/1/3/1/3/131384656/5324900.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/lepofuved-bekefapuputab.pdfIn PDF document text
    • http://damisidituwupo.iblogger.org/felazaxirebotizetekogovut.pdfIn PDF document text
    • http://fexodubavilukub.22web.org/60064326285.pdfIn PDF document text
    • https://sifumoxijobobo.weebly.com/uploads/1/3/4/4/134493963/a5a27ff63f04e76.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/qgjLW3T/bolemipaxed.pdfIn PDF document text
    • https://zupagefu.weebly.com/uploads/1/3/1/0/131070313/pupoxekuxuv.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/ihfHjjb/ruxetasemiwudi.pdfIn PDF document text
    • http://vutanojevi.iblogger.org/pen_is_mightier_than_sword_essay_in_hindi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suredutika.rf.gd/newaganosafoxanew.pdfIn PDF document text
    • http://limazajot.rf.gd/womol.pdfIn PDF document text
    • http://xunaruxu.rf.gd/abortion_definition.pdfIn PDF document text
    • http://fuwasal.rf.gd/annual_academic_calendar_template.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
    • 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_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 5248 bytes
SHA-256: 3dc26d780c28c28d8592f5c88030a402880d01ba9f83068a8db9368f2337cdf0
font_01_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 11420 bytes
SHA-256: 2c6b5c6250f9494b633e67dea9eb6782ebde18249a7de14412fc5abde6553042
font_02_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3