Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60fa973aa55c4f1…

MALICIOUS

PDF

83.9 KB Created: 2021-04-05 12:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d9df0a62c87a2be5b27591ea9581ac1 SHA-1: e1861905e1e908f91e09ea87a9d365404e79feb6 SHA-256: e60fa973aa55c4f12fec7f45d27369c2565cb5a57b890aa9c2c4ca2055ba9fb3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'math worksheets'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=grade+3+maths+worksheets+pdf
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/nazud.pdf
    • http://bnl-jobs.com/minecraft_app_uptodownkgopv.pdf
    • http://cccckkkkkdd.space/vuxelumasatapuruli8yv1c.pdf
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/bivefef-mazesi-nefer-tibuzilasa.pdf
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/1177247.pdf
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/7ddfde3.pdf
    • https://tenewalewufubin.weebly.com/uploads/1/3/5/3/135329800/2eb68b67a647e26.pdf
    • https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/tixibarosiw-dizoguditi.pdf
    • http://ketousa.site/basopomifatd7.pdf
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/1ff71d.pdf
    • https://xanojamazifedim.weebly.com/uploads/1/3/5/3/135323589/buzowiworibadiji.pdf
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/6092000.pdf
    • https://cdn.sqhk.co/pobopuwubox/jeOnigg/launch_schedule_wallops_island.pdf
    • https://cdn.sqhk.co/semiwewedazi/gexvU9J/43177174389.pdf
    • https://mewerenazedesaf.weebly.com/uploads/1/3/4/8/134885553/nagisabit-nedejufijufe-xerowowelijewi.pdf
    • http://blablablacar.online/fotumaxagofajixud7qr2y.pdf
    • http://fastdonwload.space/xabexevokaxafipubawcy8v0.pdf
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/ca6b96cb86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00010851.bin
812a6f54b99a0d8b583b6103593175d23ce78626428f8afa9ec01e4484d0f8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 5600 bytes
font_01_sfnt_off00011b4c.bin
40743f81455acca8394aac694e8addb3f838ddff6dd0c7fc274a7c03329f83d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 11560 bytes

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