Malicious PDF — malware analysis report

Static analysis result for SHA-256 615ba253ab9f8a73…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 17:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6abeae33b93e2ef7619d579e3a9cbd65 SHA-1: b0b9e555457fc9dc2d16c886454d0884160079ca SHA-256: 615ba253ab9f8a737183419513da769936c2a0ae1105e1a76b6335447028594c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'soxebez.ru', which is flagged as suspicious. The document body, though heavily obfuscated, suggests a lure related to a 'chicken egg anatomy worksheet', indicating a social engineering attempt to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=chicken+egg+anatomy+worksheet
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5fe56d4e395b9.pdf
    • https://cdn-cms.f-static.net/uploads/4527859/normal_604f0605b8fe7.pdf
    • https://static.s123-cdn-static.com/uploads/4368971/normal_5fec6716d0109.pdf
    • http://eagleaff.com/albions_seed_four_british_folkways_in_americap727g.pdf
    • http://abreudesigns.com/38061840305fxooh.pdf
    • http://airet.space/dragon_quest_dai_no_daibouken_2020_episode_1b0nhu.pdf
    • http://ndfnasg.xyz/el_nombre_de_jesus_acordes_pianon9tyh.pdf
    • https://cdn-cms.f-static.net/uploads/4385437/normal_604189d8e5810.pdf
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5fd9345ad2bba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://karifopiti.epizy.com/37045267336.pdf
    • http://ninanupazazudad.rf.gd/princess_diaries_2_full_movie_with_english_subtitles_watch_online.pdf
    • http://vumonugita.rf.gd/wunderdog_nba_computer_picks.pdf
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_55db3758b5f947a69c7d1c07115d2c44.pdf?index=true
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_aa9e5ee8e5e5404f8e6f642a2175dc15.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a01a5435-8cda-4fa4-9774-5dbdab97265d/how_to_calm_childs_fear_of_death.pdf
    • http://vuzinibijabu.rf.gd/robot_vacuum_cleaner_price_singapore.pdf
    • http://bopagit.rf.gd/autel_maxicheck_pro_manual.pdf
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_1a3813d921d24c74b71cabafd6bf5a71.pdf?index=true
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_59d4ea04d5e14cf69cc27ec80a70bb5c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c15b2b1-dae9-4ac7-945b-43053a635258/what_does_missing_or_failed_printhead_mean.pdf
    • https://uploads.strikinglycdn.com/files/699eebc8-cd0a-48d1-8bd2-6283e59863c8/95703687558.pdf
    • http://jedigox.epizy.com/annual_report_pt_angkasa_pura_1.pdf
    • http://tetizawoto.rf.gd/pemipomodugumowegaremi.pdf
    • http://gogewarixisude.epizy.com/61425354861.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_off0000e875.bin
6846b4df1da2fc78ce2567948fa53b844d33edd71eae13189aca24866c9687cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 5344 bytes
font_01_sfnt_off0000fa90.bin
b17bee5f8fa104ce4118db269f4ba13410750085477a3cd96a8ac6234020c07e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10904 bytes

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