Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b4c7dbaf2f5aaf…

MALICIOUS

PDF

66.8 KB Created: 2021-02-17 18:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ca657e277b74096477e1ad4b6f6d7e9f SHA-1: e00ff3ac978cadd4091e1b0b4260b0eac6698c18 SHA-256: 19b4c7dbaf2f5aaff2423cadff937e6d32c64d86e5dba21f70d888d9dae9ae68
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a 'bell schedule', likely a lure to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/wix?keyword=gwhs+bell+schedule+2019 PDF link annotation
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/sonusigorux-jizesakapi.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/23b7ea0b83ca1f5.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/KtjfDcF/padizazilozijimagefad.pdfIn PDF document text
    • https://mitigifagoted.weebly.com/uploads/1/3/5/3/135325532/zosumasif.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/g9Hzg9m/youtube_views_counter_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/3PWFTia/93223278064.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/jisevozazag.pdfIn PDF document text
    • https://gemunokixelu.weebly.com/uploads/1/3/6/0/136095878/7286848.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/bMhhqhg/mevuriratuk.pdfIn PDF document text
    • https://ruliduwaj.weebly.com/uploads/1/3/4/0/134016670/11a50c1678bada.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/6skfih5/xuzufefulilesoxifuk.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/Vxz6HYi/free_wallpapers_for_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/Ugghgha/bedaginolusirivev.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/gdDdmDT/pokemon_showdown_avatar_commands.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kegovev/creeper_aw_man_sheet_music_trumpet.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/paramedic_hand_off_report.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 5464 bytes
SHA-256: d1e6b213e840c52b09234fbf54555b3adb96565cdf80ab97865bbb89ad26116b
font_01_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 9920 bytes
SHA-256: 6d93aded01a7a98fd8ef75426d121d2319ddbdeeef744d52891cc7f183d8ed33

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