Malicious PDF — malware analysis report

Static analysis result for SHA-256 70148ee98f3df6c1…

MALICIOUS

PDF

81.0 KB Created: 2021-03-05 12:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c9d0bb4063bb6cea6f8cf68b3732a37c SHA-1: ca8a36f2f91d1457f6a4b3ef92f3118da3c00f3f SHA-256: 70148ee98f3df6c11b052226b5099fb9c2beb89e2986520be6b1c45ab774499b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=ozone+500+bike+29+inch PDF link annotation
    • https://cdn.sqhk.co/wuzosiboweja/c0de8i7/w3schools_javascript_array_reference.pdfIn PDF document text
    • http://idealica-italiaoficial.site/juxekuxujupudasumijuffx87h.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/CgeLibP/pojateze.pdfIn PDF document text
    • http://hopecommunitynaz.com/feed_mira_grant_charactersfrgv6.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/fujimowixetazedaki.pdfIn PDF document text
    • http://samettemiz.xyz/aloe_blacc_the_man_song2vs9o.pdfIn PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/sizaxud_nepafujosisifeb_sebisexeminap_zewol.pdfIn PDF document text
    • http://omynutural.space/674889603543chcu.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/doFHjc8/ritofipixulegowa.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/kefolajanabazuxolela.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/31d018e77.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/k3Rgjgd/pipivu.pdfIn PDF document text
    • http://fitdieta.com/98116572589rvgj5.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/five_little_ducks_piano_sheet_musickotiv.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/6872e6fe0fc85.pdfIn PDF document text
    • http://specrazreshenie.com/what_is_a_business_media_planmfel0.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/davawina/onn_dvd_player_ona19dp005_remote_code.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/annamayya_songs_zip_file.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/the_secret_life_my_secretary_berapa_episode.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_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 5204 bytes
SHA-256: 45472ce17664f4a4df981a3ef1b9ad6c79fe8f42980212c9db02c77deda6660a
font_01_sfnt_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 10848 bytes
SHA-256: f12529637c3293177e5cb44c09749c636e485a1d55b82af73fbdb57403ff72f6

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