Malicious PDF — malware analysis report

Static analysis result for SHA-256 78453c8adcf9fe1f…

MALICIOUS

PDF

84.2 KB Created: 2021-03-11 02:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: eb0cde40a7d9afde458ed9b8fe23f86e SHA-1: e4ccb3b79fc6073c02fcf8a28ed6caa56fa8257f SHA-256: 78453c8adcf9fe1faf55f50d3cce9b2426588e3cfe83e6154716cbef3370f6bb
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, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure for free downloads, aligning with phishing or scam tactics.

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://jacksth.ru/award?keyword=digital+electronics+interview+questions+and+answers+pdf+free+download PDF link annotation
    • http://dakajak.medianewsonline.com/what_are_intervention_strategies_in_education.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/hh3ucq6/51514743911.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/solid_liquid_gas_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/vgijfjc/73627531046.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/fender_passport_conference_manual.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/tenebukorelusupinubomo.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/hf2ijyK/hotels_near_storm_lake_ia.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/bixididagifativez.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/calculus_early_transcendentals_6th_edition_even_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/Uihgihc/9441633226.pdfIn PDF document text
    • https://cdn.sqhk.co/gasowifozil/g96SsVj/53621961696.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/88599216525.pdfIn PDF document text
    • https://cdn.sqhk.co/medugagoviji/gjhgdij/lone_wolf_android_wallpaper.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/is_the_audio_technica_lp60_bluetooth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/92278380323.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_3e50c0d2153d463aa1cd1a9f189d6bba.pdf?index=trueIn PDF document text
    • http://solezod.myartsonline.com/how_to_make_good_socratic_seminar_questions.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_5c16a98ad55940dbb2d9e551aae20d62.pdf?index=trueIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/zumarogamipazon.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_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 5600 bytes
SHA-256: 5f7c0945fd87d663c1de45249778d7afd653b6a2ff3f005e52c9ebbf81b4760a
font_01_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 10240 bytes
SHA-256: 303dd2182ac0a08e7f222b10d6bcb1e0bb0b5e5051c2509a5a199c7f0c5f5344

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