Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f5c2162c5302fb…

MALICIOUS

PDF

81.5 KB Created: 2021-03-31 03:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 047bff8b7ed81df77bd33a1d61df01ab SHA-1: a3da3493b0e5217f308dc2d45f467eb99e9b5c35 SHA-256: 92f5c2162c5302fb6aa7fad6bcaf6bce52f4473abfee066ce1cc15023a7340b0
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to 'Cengagenow financial accounting answers', suggesting a lure to trick users into clicking the embedded URL. The primary IOC is the external URL which likely leads to the malicious payload.

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://zajinet.ru/wix?keyword=cengagenow+financial+accounting+answers
    • http://laribij.scienceontheweb.net/understanding_clinical_trials.pdf
    • http://xufamorazogubov.sportsontheweb.net/50626781165.pdf
    • http://lojapidabud.mypressonline.com/famobobilazevaxuta.pdf
    • https://cdn-cms.f-static.net/uploads/4388156/normal_605ff976c0857.pdf
    • http://woxuruko.medianewsonline.com/46431595861.pdf
    • http://napowojeba.medianewsonline.com/absentisme_au_travail.pdf
    • http://nubatevujonuw.mygamesonline.org/free_printable_frozen_coloring_pages.pdf
    • https://cdn-cms.f-static.net/uploads/4460970/normal_603e25a79f26b.pdf
    • https://cdn-cms.f-static.net/uploads/4387226/normal_604eb3ee1cd77.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b27ad600-9a2b-43c5-9017-3317cdd28424/28957431192.pdf
    • https://uploads.strikinglycdn.com/files/25e0b07c-148e-4744-ab3a-72695d99a6df/is_a_bowflex_a_good_workout.pdf
    • https://uploads.strikinglycdn.com/files/9314bb57-cd6c-4c67-bf84-5461b5f50bf0/58016502983.pdf
    • https://uploads.strikinglycdn.com/files/e49f77bc-e451-43b5-87e7-d8e2c87a27c0/95974940388.pdf
    • https://uploads.strikinglycdn.com/files/a60a0ac3-43ec-40aa-b543-ee514a7b668c/why_does_the_heater_smell_like_gas.pdf
    • https://uploads.strikinglycdn.com/files/cde9e7eb-35a7-4158-9bdf-0f0dc718914a/is_megaboom_3_louder_than_megaboom.pdf
    • https://uploads.strikinglycdn.com/files/3964b435-dc17-4c9b-9c89-cce972491883/29360582532.pdf
    • https://uploads.strikinglycdn.com/files/fabd7873-6750-4f99-b6f6-baaed0fcae1f/bibanobopotivufi.pdf
    • https://uploads.strikinglycdn.com/files/4ba2d9eb-c140-4d86-be1b-5a5dd6a7abb1/60582256848.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28e.bin
c390661daa0118ce7e6960bc972662857e8889c50abb7dc50fe2ad4eaef7641c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 5044 bytes
font_01_sfnt_off000103dd.bin
8a208e3a123ce3e9f8c347a4f88a7daba65e09ce6c9f46776288e3b8529b8517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 11376 bytes
font_02_sfnt_off00012a9a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 4324 bytes

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