Malicious PDF — malware analysis report

Static analysis result for SHA-256 834141c734bed7b2…

MALICIOUS

PDF

70.3 KB Created: 2021-04-07 10:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c18a74cf91669a4b33cc9c773445c661 SHA-1: eda68cc405fd13239cd7fe4b62b80d42246368b1 SHA-256: 834141c734bed7b28a89fedb7ff7ec8492021b15cdd83b89d919d5d10a99e0cd
96 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 an embedded URI pointing to 'bologen.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to educational content ('apush period 5 test multiple choice answers quizlet'), aligning with common phishing tactics.

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://bologen.ru/wix?keyword=apush+period+5+test+multiple+choice+answers+quizlet
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340645bc0c.pdf
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/e465e82af.pdf
    • http://mkr-olimp.info/vowezurofinugegojaxixabac41m1.pdf
    • https://cdn-cms.f-static.net/uploads/4443804/normal_601ec6accb63b.pdf
    • https://cdn-cms.f-static.net/uploads/4472503/normal_603b3b668791a.pdf
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/1243d74d49625.pdf
    • http://maxoranano.sportsontheweb.net/nunebivelufifibemu.pdf
    • http://minuette.me/59772316208ye4ct.pdf
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/jupagupafikazezel.pdf
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/2fe449a7e79b3.pdf
    • http://nubolats.xyz/mini_snake_plant_for_salec2av3.pdf
    • http://fetesitomer.mygamesonline.org/differential_pulse_code_modulation_theory.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sezebepit/17401855213.pdf
    • https://uploads.strikinglycdn.com/files/96ab3522-8d73-4df0-b733-b13e82f7538b/fourier_cosine_transform_of_e-ax_cos_ax.pdf
    • https://s3.amazonaws.com/bezorito/rscit_december_2018_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/d8f3e74a-1ec5-4f89-8593-49a95a8785cb/gezorowimar.pdf
    • https://uploads.strikinglycdn.com/files/de2b6874-45b2-4004-908e-00c27e109de4/does_whitebeard_really_have_a_son.pdf
    • https://uploads.strikinglycdn.com/files/adbaefac-6060-40f2-bc20-59b041240a83/kotekonokotemavisup.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_off0000d2a1.bin
9e93bd938688e74090ec5dee6526c5de412d2b3417887a29f67808191df8ff80
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 5692 bytes
font_01_sfnt_off0000e5f4.bin
dfc6d7042c4e0d7e2c4993775468d02b495cc5889a33c6d0106270bbe7f3bfd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 11204 bytes