Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec93a631738dda56…

MALICIOUS

PDF

71.2 KB Created: 2021-03-17 23:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c539342dadb29b155499dc0ceed1c82 SHA-1: 18f926dea8b845538985d838f255b88d204e0529 SHA-256: ec93a631738dda56e87e17f3e0cfca467005ce93ef549aea319af6ebe9a66b70
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains a search query related to 'boy scouts christmas trees near me', which is likely a lure to drive traffic to these external sites. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=boy+scouts+christmas+trees+near+me
    • http://sijemogezabusa.sportsontheweb.net/why_wont_my_mic_let_me_talk.pdf
    • https://xafijaxipumin.weebly.com/uploads/1/3/5/9/135966545/lujibagavirukow-zafonikelode-nefimeluf-sivijex.pdf
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/3529823.pdf
    • https://mazaxijav.weebly.com/uploads/1/3/4/4/134488449/8777228.pdf
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/nebilo.pdf
    • https://nibiromevisike.weebly.com/uploads/1/3/5/2/135299411/dixep_jaxuduzanetisav_sonefiniletuv.pdf
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/3238877.pdf
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/513dbc4549.pdf
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/riwovadexago.pdf
    • http://wijetaz.mypressonline.com/kusamozivelobivodegutosoz.pdf
    • http://xufededubumavif.scienceontheweb.net/boxakarobodago.pdf
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/zomox_jazupigus_funuboxudifo_rotovix.pdf
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/jaxurusedegusulebod.pdf
    • https://razavewi.weebly.com/uploads/1/3/0/8/130813306/febat-tupabezupen-lizoxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gupizamowakop.myartsonline.com/how_do_you_understand_political_science.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db43.bin
5c7eaa827e7d9c32f74397ff3262d4ad91d9ac4289918cfa0da9cb7c03d38131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 5156 bytes
font_01_sfnt_off0000ecab.bin
2871b3386dae8d0c543407bf782d2b0927b29dfca7340bbcb26f917f90dcd7c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 10320 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.