Malicious PDF — malware analysis report

Static analysis result for SHA-256 86493b03c3f3579d…

MALICIOUS

PDF

88.6 KB Created: 2021-03-22 00:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 753f4fefdbae0fa2c444aba537e76a8c SHA-1: b0122c2a7ed952fce8d1533d090bebec8d8f44cc SHA-256: 86493b03c3f3579da88099156ab7cb29dc58ade118b1115f1ec72cbd4ea51ecc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/wix?keyword=persona+normal+taibo+pdf
    • http://rivuxini.66ghz.com/jirebodojuxurogovaxa.pdf
    • https://cdn.sqhk.co/zaviresodew/jgjKMia/aplikasi_saver_reposter_for_instagram.pdf
    • https://rogubadivuna.weebly.com/uploads/1/3/4/3/134337887/6697686.pdf
    • https://cdn.sqhk.co/ratobomebal/fjheRhd/62228944668.pdf
    • https://cdn.sqhk.co/nexoratuxi/Tgc9HS9/best_free_pencil_sketch_app_for_iphone.pdf
    • https://static.s123-cdn-static.com/uploads/4419623/normal_5fc99b0d98d4d.pdf
    • https://cdn.sqhk.co/feneradebeza/ROOPZgc/little_heroes_pediatric_dentistry_mission_tx.pdf
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ff65eb83f8b3.pdf
    • https://fejevudud.weebly.com/uploads/1/3/2/6/132695511/60e50e0564be31.pdf
    • https://cdn.sqhk.co/zuxosutuku/jhUjdjd/horse_racing_3d_1._0._5_mod_apk.pdf
    • http://jigatinapa.22web.org/antenna_tv_channel_guide_chicago.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_8e355274d849448bbe97dfbc48196de4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b6888e17-9dcf-4994-a74b-236f3d536ca9/28900619846.pdf
    • https://uploads.strikinglycdn.com/files/cebb864d-2039-4e06-ba42-76498cebfd58/united_healthcare_credentialing_application.pdf
    • https://uploads.strikinglycdn.com/files/c4f38ea6-5648-43ba-875d-b7483695e9d0/is_thinkorswim_free_in_canada.pdf
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_1c9f10fee5924be1ac6be6a73b0e3616.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7397c1f7-d43b-4725-ae2b-bead34c01fa4/40320577989.pdf
    • https://f7927488-8152-43cb-a667-e231f58cc5c5.filesusr.com/ugd/950cc9_4c88a261eed54d7da663cf3e71534516.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44892842-4469-4ef6-b251-0deef9afffa8/going_postal_jacksonville_north_carolina.pdf
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_7064726cdd684730a17698a100dda302.pdf?index=true
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_0ce04969e34d476cbe30373d309dfac8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72b.bin
7132754f9a44914025617ca214a0728b69f9d377b893d3871c24c4d2b5384ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 4464 bytes
font_01_sfnt_off000106c0.bin
d2565d312cbcbe9aa65d7202a695fae7f356e27b9e06231662c19d2b2b5a7a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 5116 bytes
font_02_sfnt_off000117f6.bin
637153b3cd60dd0b7fe7f1947155e999b19a560b221d5f7b93c69afbb1202b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 14212 bytes
font_03_sfnt_off0001461f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1461F 4324 bytes

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