Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b539ad1975d3b3…

MALICIOUS

PDF

79.3 KB Created: 2021-03-31 02:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29af64770c897800e482bbcee5f805de SHA-1: 69905ad70184b5b11bc03649879dc085c79dcae7 SHA-256: 03b539ad1975d3b305ab591321991beff95d552360a90af4bec7c5ecab8a3619
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, https://pelibifir.ru/award?keyword=student+learning+outcomes+pdf, suggests a phishing lure related to academic outcomes. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=student+learning+outcomes+pdf
    • http://zdorovienashevse.xyz/dew_point_and_relative_humidity_lab_answers9jhbd.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • https://cdn-cms.f-static.net/uploads/4475392/normal_6024b6da89a46.pdf
    • http://vezerfa.xyz/why_is_my_washing_machine_not_spinning_all_the_water_outpn1lz.pdf
    • https://cdn-cms.f-static.net/uploads/4383467/normal_605dc98598a20.pdf
    • https://cdn-cms.f-static.net/uploads/4488582/normal_6046dfb799192.pdf
    • http://good-production9.site/kilojuuoehm.pdf
    • https://cdn.sqhk.co/lirotigi/giijpWD/android_bitmap_to_base64.pdf
    • http://argo-tourism.com/hebrew_english_interlinear_bible_transliterationhqjwc.pdf
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5ff2133a6ca76.pdf
    • https://cdn.sqhk.co/dimusokobab/c7iIsib/95824037437.pdf
    • https://cdn-cms.f-static.net/uploads/4448991/normal_603560a9b5728.pdf
    • https://cdn.sqhk.co/kululojilo/8wchDie/zimijodajuvuvibijewu.pdf
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fd06312aa6d7.pdf
    • https://cdn-cms.f-static.net/uploads/4369331/normal_60100722b8f3d.pdf
    • https://cdn-cms.f-static.net/uploads/4367000/normal_60439738a936b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mugoxox.epizy.com/42487356822.pdf
    • http://forafunivotefu.rf.gd/12977912120.pdf
    • http://sifepilojiba.rf.gd/rinnai_v1200_troubleshooting.pdf
    • http://dejexek.epizy.com/what_is_a_synonym_for_listening.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83a.bin
314499789b3999cf034f9a203bdc7311b11fbe8862b2068be8521d8dc389aaca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 5580 bytes
font_01_sfnt_off00010b27.bin
b6d11a9fa063c5776ea95dc18dcb191dc9f10917c82aa2f89088116bd28eca4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 10992 bytes