Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a2230231191bb0…

MALICIOUS

PDF

77.5 KB Created: 2021-02-13 13:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ef37bed04af0c8e4035f76f8982b2848 SHA-1: e91d9cfa15e46e0d72bbed3df556565bbcf007d6 SHA-256: f5a2230231191bb01fa9ebb9e85bbd509a8debcb857547886314f18792f6bfa2
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 pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=texas+law+pocket+guide PDF link annotation
    • http://mastericy-chistoty.ru/underseat_luggage_18x14x8gfhh3.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/5622471.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/XicgM8o/46818471462.pdfIn PDF document text
    • https://cdn.sqhk.co/tarozawowe/ajazhiE/69348191420.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457604/normal_60080963e00c8.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/tjc3gfU/grow_idle_archer_guide.pdfIn PDF document text
    • http://contentmedialiteracy.com/84465566397uwt8i.pdfIn PDF document text
    • http://zanartcc.net/jodubofugobapt0eag.pdfIn PDF document text
    • http://hangookoil.ru/22790424944912f.pdfIn PDF document text
    • http://yewes.space/genukiwumipopazopjyu7.pdfIn PDF document text
    • http://private-channel.site/98980581820wyp6f.pdfIn PDF document text
    • https://rikisefunem.weebly.com/uploads/1/3/5/3/135337995/6412587.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/ZZje5Wp/90520191460.pdfIn PDF document text
    • http://brumbum2.xyz/faded_piano_gamegsbfl.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/NjjPrgg/gaming_wallpapers_for_pc_4k.pdfIn PDF document text
    • http://tersq.fun/nebikavalenirokabokk5i1m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalilom.epizy.com/juxefumavodiwipipesapi.pdfIn PDF document text
    • http://sizikipap.epizy.com/android_assets_path_string.pdfIn PDF document text
    • http://tebokemirutexus.rf.gd/information_on_anthrax_bioterrorism.pdfIn PDF document text
    • http://netupizorazez.rf.gd/practice_6-_1_classifying_quadrilaterals_worksheet_answers.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/mla_outline_format_template_word.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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 5320 bytes
SHA-256: c38d965cff47b7372e532691778371e25d0acc6cee92de45cd9b47ea87e9dea0
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10596 bytes
SHA-256: 35069561e8ae8afb32b75e0e030f15a1f38876c4fcc589c9b3338b05c66de97e

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