Malicious PDF — malware analysis report

Static analysis result for SHA-256 4465281b01315d5d…

MALICIOUS

PDF

81.7 KB Created: 2021-03-18 10:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd8dcba9dd2f290c03573e6b0d3dcc1e SHA-1: ded3f9a51e8594dc09e66eb2e9c1de6ccac361a1 SHA-256: 4465281b01315d5d8664f4af4466cc69ee8412b84dd5661fefe37c8ad0fdba1e
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious URL that appears to be part of a link farm. ClamAV also detected this file as a phishing trojan. The presence of a 'download' lure further supports the malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=gmod+free+download+chromebook
    • https://cdn.sqhk.co/tokarikadez/hoPif0s/38880827370.pdf
    • https://cdn.sqhk.co/tixuniwe/aSN6BAC/air_hockey_soccer_tournament_bracket.pdf
    • https://cdn.sqhk.co/fasotaluvose/gfieiiL/riwede.pdf
    • https://cdn.sqhk.co/xafeperale/hEUjieK/xuzetaxegoxepiroxivoje.pdf
    • http://onlinesos.tech/wadomimukowelokepito7malj.pdf
    • https://cdn.sqhk.co/xidafigutoxa/8hcqDhf/virgin_mobile_cineplex_2_for_1_code.pdf
    • http://instacopyrighthelpteam.com/digowitapokajopexyglh.pdf
    • https://cdn.sqhk.co/melipetoluf/COiilhd/46501956732.pdf
    • https://cdn.sqhk.co/saturarad/j80ohdM/bitlife_life_simulator_play_online.pdf
    • https://cdn.sqhk.co/gizolaxufo/FjfnChh/tulerapuvujenub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tumuzu/briggs_and_stratton_engine_serial_number_search.pdf
    • https://s3.amazonaws.com/jemazejodep/bolexozizipevikawoxosu.pdf
    • https://s3.amazonaws.com/tanapilamaxi/how_to_write_a_love_poem_for_beginners.pdf
    • https://s3.amazonaws.com/pilazi/arts_and_crafts_for_toddlers.pdf
    • https://s3.amazonaws.com/jukoxisojow/change_pressure_on_ryobi_pressure_washer.pdf
    • https://s3.amazonaws.com/rorives/2004_honda_odyssey_headlight_assembly_replacement.pdf
    • https://s3.amazonaws.com/lurutopobi/34002771594.pdf
    • https://s3.amazonaws.com/jobavo/bal_ganesh_2_songs.pdf
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_405523af84b547f9a754deb81b1a6656.pdf?index=true
    • https://s3.amazonaws.com/wemazun/vuridenojosonepusa.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_ff6e6fd9bd0746df8fdfe03425afdd05.pdf?index=true
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_ad0570f05bb44b2faa096ac582e08e44.pdf?index=true
    • https://s3.amazonaws.com/fipijife/82195194632.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_off0000f190.bin
9880255bdb0dee9eb3782db82a7af6c16f73ca9638c33915c8d3f11b43797a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 5068 bytes
font_01_sfnt_off000102ad.bin
209347f851c8025dd3e1d92f63fbb7cf92bf6603b01086f87210c243c32a8d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 11452 bytes
font_02_sfnt_off000129a0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 4324 bytes

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