Malicious PDF — malware analysis report

Static analysis result for SHA-256 84851288fcac0de7…

MALICIOUS

PDF

113.7 KB Created: 2021-01-10 18:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 006f6282a89b3d04da99b559b25c537b SHA-1: 99e1f1154b9c4147d39bd22e0411b19ff1b737f9 SHA-256: 84851288fcac0de79e2594d48abc5bc784ae7ca593113c275e9a2a0aa284147f
166 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. The file contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature of 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffnew.ru/123?utm_term=the+kugelmass+episode+pdf PDF link annotation
    • https://site-1171656.mozfiles.com/files/1171656/cute_hairstyles_for_curly_hair_toddlers.pdfIn PDF document text
    • https://site-1176958.mozfiles.com/files/1176958/tidunegifulavusofekuwuras.pdfIn PDF document text
    • https://site-1176402.mozfiles.com/files/1176402/grumpy_cat_birthday_meme_funny.pdfIn macro / runtime command snippet
    • https://site-1173403.mozfiles.com/files/1173403/gaming_pc_wallpapers_1080p.pdfIn PDF document text
    • https://site-1237331.mozfiles.com/files/1237331/hill_climb_game_online_pc.pdfIn PDF document text
    • https://site-1178794.mozfiles.com/files/1178794/responsive_navigation_bar_tutorial_html_css_javascript.pdfIn PDF document text
    • https://site-1176876.mozfiles.com/files/1176876/download_game_godus_mod_apk_android_1.pdfIn PDF document text
    • https://site-1177392.mozfiles.com/files/1177392/dinosaur_battlegrounds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5fa98d3c27d10.pdfIn PDF document text
    • https://site-1176202.mozfiles.com/files/1176202/egg_finder_appvn.pdfIn PDF document text
    • https://site-1171882.mozfiles.com/files/1171882/japan_basketball_scores_live.pdfIn PDF document text
    • https://site-1084052.mozfiles.com/files/1084052/mefewujikozukimudiwolirux.pdfIn PDF document text
    • https://site-1179316.mozfiles.com/files/1179316/fefulabarekowafap.pdfIn PDF document text
    • https://site-1176958.mozfiles.com/fiIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/polexebuj/kebujekovisugixorotere.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_off000182a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A1 5372 bytes
SHA-256: 11630dc014cdbd9e37dfcdac3f75b361cc5ed420bb00d011b55a58e2fd6f880d
font_01_sfnt_off000194c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C7 10820 bytes
SHA-256: c710e4ea09c22b4535c031b776c0fea0857e0e9d409558adaef1f03c2069918d

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