Malicious PDF — malware analysis report

Static analysis result for SHA-256 1859f2f16ea34860…

MALICIOUS

PDF

133.7 KB Created: 2021-02-12 08:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 269c3067ae0a416e40e100e7e5ca0ebf SHA-1: 961c9194ec764a416be5cd581d81aa0abb6fd411 SHA-256: 1859f2f16ea34860890b6b304a244b1070410c669f9ea2385bfd8450887a637f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to deliver further payloads or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=constructing+a+phylogenetic+tree+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/gadukupuwe/bhcbibE/download_game_dragon_world_mod_apk_revdl.pdfIn PDF document text
    • https://sinosopad.weebly.com/uploads/1/3/4/8/134892142/kotose-wovogulalux.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/d30GsSH/usher_slow_songs_playlist.pdfIn PDF document text
    • http://insurancecarusa.com/faxitonuzex4unqm.pdfIn PDF document text
    • http://ighelpcenter.xyz/62153162224ddrj6.pdfIn PDF document text
    • https://xifalazixaxidig.weebly.com/uploads/1/3/0/8/130874217/xajage.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/iegjQhi/5857173295.pdfIn PDF document text
    • https://sivabukejiwija.weebly.com/uploads/1/3/4/4/134459056/zapizuzalanev.pdfIn PDF document text
    • http://roskycnmx.com/cytus_2_miku_apkjk5lp.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/9496757.pdfIn PDF document text
    • https://zumofadun.weebly.com/uploads/1/3/4/0/134042547/7076952.pdfIn PDF document text
    • http://mmeueue.space/jokujebapirilip4wltw.pdfIn PDF document text
    • http://ourfutures.space/webexavixuvufizupafuxaxhd8s0.pdfIn PDF document text
    • http://1fps.ru/sujisopa0ilw5.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/modern_warfare_servers_lagging_august_2020kneo5.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/QgdBric/xomaki.pdfIn PDF document text
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/tavixesa-vewira-rojudafazije-xuxikanajubune.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/tunenijexe/aids_kasa_hoto_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/charandas_movie_songs_free.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_off0001d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D152 5360 bytes
SHA-256: 6400226cfcff3e2778968e39419c23c63c7d780c0b4d3937b20627b7165c3611
font_01_sfnt_off0001e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E39B 10856 bytes
SHA-256: 0d757ce9f6b9e30b9f1951b38c8782de176eb106c8be3748e659ce577284dcf0

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