Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f06f03ffe57874…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 14:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6ff87e1bd40c4877cbf99ff6d2545fde SHA-1: 9997dbdd236ae62d322784d81edeb5b76179634c SHA-256: 23f06f03ffe57874435d30b81862ff7c8dbf1ad140798072cce55671f4f3456f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to educational materials, further supporting a phishing or social engineering attack pattern.

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://zajinet.ru/award?keyword=cambridge+3+listening+test+2+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423428/normal_602bd928d4263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_60188cf17f850.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/bodyweight_exercises_book.pdfIn PDF document text
    • http://gigewaxupupixe.22web.org/free_indesign_yearbook_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481673/normal_5fe00f16721b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5fddbf6f2cfed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_60602a3c2afe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6033cad37ffba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_5fd1283dba25b.pdfIn PDF document text
    • http://mukovasisoro.mygamesonline.org/jajasen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_605a05988c5f0.pdfIn PDF document text
    • http://lenagilos.22web.org/how_the_earth_was_made_video_guide.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/6682234651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovawasokagi.epizy.com/55258151465.pdfIn PDF document text
    • http://xelidev.rf.gd/dbms_utility._format_error_backtrace_oracle_9i.pdfIn PDF document text
    • http://perinuve.epizy.com/benefits_of_public_private_partnership.pdfIn PDF document text
    • http://fejasafevavo.epizy.com/kisuzumefasuzataxep.pdfIn PDF document text
    • http://naxaroxabim.rf.gd/xatuwifapalaxajexev.pdfIn PDF document text
    • https://youtu.be/ihi3hKeKXX4In 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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 5796 bytes
SHA-256: 35b2df2158ecef37904c365016181d21d55e2609ebcdc6379c001daa75843c4f
font_01_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 11408 bytes
SHA-256: 7f694ad415fe2647346d068f7160d62aa7d0a85414bacbf50a015adf8466952c

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