Malicious PDF — malware analysis report

Static analysis result for SHA-256 2023c1f9db9c1b3d…

MALICIOUS

PDF

83.8 KB Created: 2021-03-14 15:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e77e48f17686a589fd5e973dba39932d SHA-1: 2dd1b2c63c40f4ee2d9dd52be649a1bda4ea0dfc SHA-256: 2023c1f9db9c1b3deea7fead09f0ccc0417d9f79ea199c858e515d9e5db05710
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious download lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=showbox+apk+for+fire+tablet PDF link annotation
    • http://m-laskin.ru/60925720457eewb3.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/69127522816.pdfIn PDF document text
    • http://sport-stavki.fun/sony_dcr-sx63etfmyz.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/wzUngdy/lozijovuvakaxomefo.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/day_of_tears_book_free_online5hf9v.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/1wLyojN/pomojafajorom.pdfIn PDF document text
    • http://subejewumo.scienceontheweb.net/ext_gl_calendula.pdfIn PDF document text
    • http://abreudesigns.com/software_test_engineer_salary_in_canadacdqw0.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/3850028.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/78302206449.pdfIn PDF document text
    • http://becloud.website/cch_reset_tp_link_841n5dxlu.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/hjc2Oii/princess_prom_makeup_salons.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/qhigido/640903875.pdfIn PDF document text
    • https://miwefotuwid.weebly.com/uploads/1/3/0/9/130969826/potalimefomom.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/ghjhnje/58611892976.pdfIn PDF document text
    • http://wuvozikeximufuk.iblogger.org/52241255038.pdfIn PDF document text
    • https://jepigosewuva.weebly.com/uploads/1/3/2/3/132302921/zomepixureselixigejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivozusemu.atwebpages.com/28351481372.pdfIn PDF document text
    • http://zefexulipovi.rf.gd/fusionner_des_fichier_en_ligne.pdfIn PDF document text
    • http://kazaxeso.rf.gd/liftmaster_3280_logic_board.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_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 5280 bytes
SHA-256: 212ac6dfc65bb0ab8a13ddeb32822748e1262216c04bc426c64d268e9e35cb43
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 11316 bytes
SHA-256: 0ad12ba8395378537a99969527ae87e33ce6907b0698087d05c601e8efa5340c

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