Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb56b61132d36a9…

MALICIOUS

PDF

64.1 KB Created: 2021-03-18 17:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bc7bff198c014224372eb34f945c8049 SHA-1: 9c16efc02e4b876111dccccc1aa0669c9ee95964 SHA-256: 1bb56b61132d36a9dd1bf696d1db287b7390123d4dc8a398d463a5a299cc96ab
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/award?keyword=connotation+and+denotation+worksheets+8th+grade+pdf PDF link annotation
    • https://cdn.sqhk.co/tirazirevemu/YXghCjc/89580676646.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/kobuzosivej_gesak_duzupedixu_tunuxuja.pdfIn PDF document text
    • https://durabikat.weebly.com/uploads/1/3/4/5/134512276/betoxumefube_xujuzaxasum_nadape_tobigotunazim.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/kodakumetut.pdfIn PDF document text
    • https://zisojuvamifofe.weebly.com/uploads/1/3/1/3/131383842/a7d67b0.pdfIn PDF document text
    • http://gejikojaki.scienceontheweb.net/chinese_approach_to_management.pdfIn PDF document text
    • https://cdn.sqhk.co/dinewemilo/X7zffma/tefekukanisimedepaxawoz.pdfIn PDF document text
    • http://usene.xyz/rift_no_hdmi_connectionsypca.pdfIn PDF document text
    • http://akfb.online/spellsword_cards_demontide_cheatsfl58k.pdfIn PDF document text
    • http://rexexepunefa.22web.org/frozen_shoulder_exercises_spanish.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/nozutozedemoxanitubujabep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejugezefufuli.rf.gd/tezujufokejarada.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/letter_tracing_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/92380336471.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/ginimolaxa.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_off0000be08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE08 5528 bytes
SHA-256: 616379f28bd1e3113b296a419efe3b10ce8c7dc78dd046bb907cf94b895c96a1
font_01_sfnt_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 10068 bytes
SHA-256: 4476ee3c72a3a3a31cc89ed8a1cad16cec9159111638053186533ed92edbb411

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