Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dc1ee45b24d8d7…

MALICIOUS

PDF

85.3 KB Created: 2021-03-06 22:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ebb245931cccda610864e585b8dd0826 SHA-1: 3298f5343173a9a032aaea1b180514d9eb7b30e7 SHA-256: 23dc1ee45b24d8d74451c573ac6367992cff77c6896801a58f81fa85d26dc46f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=3rd+kalma+in+english+text PDF link annotation
    • https://cdn.sqhk.co/pewesopefim/hj8jbhf/87660612778.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/intermatic_light_switch_timer_battery_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/2BLrhdk/red_vs_blue_season_18_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5fcbc2f484d9d.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/ruzaxav.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/9912919.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/datigufu.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/a010bf01b6b78f.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/fedezipopikodo.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/2858429.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/Kcifje5/lorisidajovejexuwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fc5a02d8e322.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/pirunafavawofare.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/utzmjeY/ripoxi.pdfIn PDF document text
    • https://xuwukebi.weebly.com/uploads/1/3/4/4/134472968/c3dec90f2.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/wipases.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/YzKje2X/60251262308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bamoxopigodarok.epizy.com/apple_music_on_android_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/lymphatic_vascular_malformation_radiology.pdfIn PDF document text
    • http://mowiredeponup.rf.gd/libro_hermosas_criaturas_saga_completa.pdfIn PDF document text
    • http://robabunegulawi.rf.gd/adidas_shorts_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/79676413046.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/text_mining_tools_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001242c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1242C 20484 bytes
SHA-256: 3d5633c86f2ea5fd2b7e047093c0de537187e732c6a3d5999a3d42c1632098fa
font_00_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 5440 bytes
SHA-256: 023fc4ec5e6fabe21a0969bbe095dd0b86b9af3c2dbc6d7f83d57e9e523d070e
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10248 bytes
SHA-256: e974aa8cd66bac7a30b5a3aab1d0c8b2c552ea9f190263cb4289c81cdccb7bac

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