Malicious PDF — malware analysis report

Static analysis result for SHA-256 22184f868de17392…

MALICIOUS

PDF

89.6 KB Created: 2021-03-04 18:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6efd79a226afd2cb46926eb46c4567e8 SHA-1: 54467438b560327abaacc40619ce6ff88ace9d81 SHA-256: 22184f868de17392a65a7dccfeb747c679a16be037b8beef6986d0c681ff59f0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. 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. The presence of multiple external URIs and the link farm heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=bhadra+lakshmi+stotram+lyrics+in+telugu PDF link annotation
    • http://damvglaz1.xyz/74008097837e39uc.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/15094048902.pdfIn PDF document text
    • http://zixudisomiv.22web.org/xojagenunebuluxumol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_603cc8714a8ca.pdfIn PDF document text
    • http://8gusevshop.space/144487811410916y.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/how_to_use_a_whirlpool_thin_twin_washer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_603ec0cd7613d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_601780df9cf52.pdfIn PDF document text
    • http://katipef.medianewsonline.com/8599068925.pdfIn PDF document text
    • http://tiktokhd.design/wedosuzefekesb49zo.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/7098166225.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/60579622009.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/how_to_use_imax_b6_charger_nimh.pdfIn PDF document text
    • http://lawinafudem.22web.org/nezuridalur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486206/normal_600529cf21ec2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://mokowiwar.rf.gd/pencil_drawing_easy_images.pdfIn PDF document text
    • http://kifarir.rf.gd/derrida_the_animal_that_therefore_i_am.pdfIn PDF document text
    • http://dakovemusurevo.epizy.com/simile_and_metaphor_worksheet_7th_grade.pdfIn PDF document text
    • http://vuremekewema.rf.gd/aashiqui_movie_full_video_song.pdfIn PDF document text
    • http://zedovapovakodev.rf.gd/albion_park_high_school_uniform_policy.pdfIn PDF document text
    • http://xuzinom.epizy.com/vuvosasobix.pdfIn PDF document text
    • http://dowuxufab.epizy.com/98358840225.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_006_off00012a9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A9E 24624 bytes
SHA-256: c0fcb1c8a60dbe2a9ceccbea2a7fc3853c0ed9ad82ab4f9a29f30ba8aa8c47ad
font_00_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 5568 bytes
SHA-256: f4fe9c097b678987cbd5910552d1949de03b5e6db70400d4221a3eb2f16af884
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 4300 bytes
SHA-256: 1be51c363ec78b3c847a9a7c97b0a67554116ef507a19be4dc22d1ebff464f13
font_02_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 12356 bytes
SHA-256: 2478ad4af0794005a36bdc9148fa12d510b083ec3bad572fd945b8a9059a276f