Malicious PDF — malware analysis report

Static analysis result for SHA-256 22368b1e112eb153…

MALICIOUS

PDF

92.0 KB Created: 2021-03-21 09:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 88c6b31243ca36307919a1fdb8b66290 SHA-1: c07ea541859fa6cea869fcde0872c79880d2b12f SHA-256: 22368b1e112eb1533f5014ffcf50c08748aa74cbfc5700f589c090b620b58040
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. It contains a significant number of external links, forming a link farm designed to direct users to various websites, some of which are hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'Life's little instruction book'. The presence of numerous external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/strik?utm_term=life%2527s+little+instruction+book+volume+1 PDF link annotation
    • http://nesobaka3.xyz/guitar_grimoire_reviewx7ci0.pdfIn PDF document text
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/xivoref-mogek.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/WheZ6ic/monster_truck_destruction_hack_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kavevanix/kY58F2K/hyderabad_weather_report_telangana.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/thgQlja/wefelizofufubudibetano.pdfIn PDF document text
    • http://oneitshop.pro/49206235614a7utu.pdfIn PDF document text
    • https://kozunetumoniwav.weebly.com/uploads/1/3/4/4/134482294/selok.pdfIn PDF document text
    • https://cdn.sqhk.co/mufipofunup/gjioFo0/games_to_play_online_with_friends_free_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/lOxujam/jinupefe.pdfIn PDF document text
    • https://vifabuwu.weebly.com/uploads/1/3/1/6/131606679/zanejofiwux.pdfIn PDF document text
    • http://priz24.site/oyunsunucum_cs_1.6_bot_paketi4ok7q.pdfIn PDF document text
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/c63141d7.pdfIn PDF document text
    • https://zeruposizagaki.weebly.com/uploads/1/3/4/8/134854722/f966dec3.pdfIn PDF document text
    • http://ulekschool.online/muvasapukfzjvl.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/9824557.pdfIn PDF document text
    • http://ogranifruit.space/molibosimarenentyi8.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/e1b4cdc15.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/1110884.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/BjcGLhe/rakiv.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/nTyGvjf/mokegorepipudek.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/KfhcRu8/6525946830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xiwexuxe.atwebpages.com/xizowagebedusozumuv.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/calendario_escolar_2020_tucuman.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012a23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A23 23520 bytes
SHA-256: 1defb6f1a5cb9d44b00ce52e036c950f3b998056966dd44d89903658ea38918d
font_00_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 4992 bytes
SHA-256: 99ae63d45c0c5a9d5be58c7fc7253ce78810024b6d56e0fdddb3c414f0cc6d10
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10812 bytes
SHA-256: 9657f0c166d6d41d245ad45ec83be1598a4d233df07dd54f0675557f696e3adc
font_03_sfnt_off00015371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15371 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34