Malicious PDF — malware analysis report

Static analysis result for SHA-256 7710643660c7a4c3…

MALICIOUS

PDF

83.0 KB Created: 2021-03-14 13:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0158fb6ec33ffc18342eb157528d7866 SHA-1: e8cc6d8a7a17c968a4961b8679aca3c25f347ce0 SHA-256: 7710643660c7a4c3a5b820e2175a3050d1cf705a50dea55b0060b1577d59e102
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'administrative assistant training manual pdf'. The presence of numerous external links indicates an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=administrative+assistant+training+manual+pdf
    • https://cdn.sqhk.co/dalubevemex/Qjahfgj/walking_dead_season_10_finale_premiere_date.pdf
    • https://cdn.sqhk.co/forinabam/ibhjThj/aquapark._io_apk_download.pdf
    • https://cdn.sqhk.co/nozedimasav/vgeheA4/34132990654.pdf
    • https://cdn.sqhk.co/felodunom/C4ichfl/play_space_invaders_online_free_no_download.pdf
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/9473666.pdf
    • http://leafester.online/what_are_the_rules_for_a_learners_permit_in_floridaiopkv.pdf
    • https://cdn.sqhk.co/nutewakizi/ymjcOV3/mujelar.pdf
    • https://cdn.sqhk.co/verexumifo/x1J6ejb/piano_tiles_3_mod_apk_free_shopping.pdf
    • http://intereriia.com/baldi_s_basics_easy_mod_apkr6dkb.pdf
    • https://cdn.sqhk.co/wafavalufa/dvgjfZv/regency_theatre_in_perris_ca.pdf
    • https://budafamilefa.weebly.com/uploads/1/3/1/4/131452884/79048.pdf
    • https://cdn.sqhk.co/zuxatotukaru/eZpDiid/alex_galchenyuk_injury_report.pdf
    • http://deutschebank-meine.com/flowchart_symbols_and_meaning_pptlcfs5.pdf
    • https://cdn.sqhk.co/sizozizaj/DPgfuSa/goosebumps_night_of_scares_gameplay.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulujono/momuwut.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_f31172c6dd16409f86baddc708f389ef.pdf?index=true
    • https://s3.amazonaws.com/degisapemifa/mammogram_screening_guidelines_canada.pdf
    • https://s3.amazonaws.com/lezerawe/gagaduwabalisivapumomemi.pdf
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_bea8849b0c28404d9acb2f7e8dc67242.pdf?index=true
    • 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_off0000f430.bin
799d6dc51aac3ff507df0cb5138cb285797bdb266dca50b5aac088dba57522b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 5412 bytes
font_01_sfnt_off00010681.bin
b5b8990b4e82e759d862f0b673429eec6996f764d130472294a31da699e12c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 4396 bytes
font_02_sfnt_off000117b5.bin
98d899f8587a8d4ed1f0ca80fd77127c1c4cdbc3b9288e3acaa8aafdd535985e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 10936 bytes

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