Malicious PDF — malware analysis report

Static analysis result for SHA-256 881373e984785fbe…

MALICIOUS

PDF

78.4 KB Created: 2021-03-19 13:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4671232f270dcda7fda00da59591bd28 SHA-1: 5652798b8cc84fda1f1db3fefe5f743dd96add65 SHA-256: 881373e984785fbe5139462d45593efc3063e86820f37a050dfc675c6f01397e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that directs users to a suspicious domain, masquerading as a repair guide. Heuristics indicate this is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious phishing content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to a malicious site for further exploitation.

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://jumiwimov.ru/strik?utm_term=how+to+repair+milwaukee+m12+battery PDF link annotation
    • http://javebamugizal.66ghz.com/synaptics_driver_windows_10_64_bit.pdfIn PDF document text
    • http://wurulef.22web.org/10841146085.pdfIn PDF document text
    • http://wawejamivejaxu.22web.org/murachs_php_and_mysql_2nd_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/OB4jg8r/vanugelodedeti.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/cepXi6P/red_carpet_italian_models.pdfIn PDF document text
    • http://ruxuruweluwi.iblogger.org/promissory_note_form.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/37377314986.pdfIn PDF document text
    • http://xavimelobuvi.22web.org/laxenowo.pdfIn PDF document text
    • https://cdn.sqhk.co/meparifemoji/g37P2ef/congenital_hypothyroidism_guidelines_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gevejonitu.onlinewebshop.net/english_words_with_sinhala_meaning.pdfIn PDF document text
    • http://bojakufuxelev.epizy.com/26479055780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed52bc6-c018-4705-bdf7-d35a1f2ca03c/3710198679.pdfIn PDF document text
    • http://jujujinoxilumaz.epizy.com/singer_profinish_serger_price.pdfIn PDF document text
    • http://finuzajobozosom.epizy.com/jitufov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fbc34c-d0aa-4c0b-a6cf-b67db676af14/4899092054.pdfIn PDF document text
    • http://pekufupudemolor.epizy.com/toposup.pdfIn PDF document text
    • http://natadomemorad.epizy.com/zizivexulanefip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2534fc0b-80e2-4757-bb2f-0d118b9ed5b1/tekonsha_90160_primus_iq_electronic_brake_control_instructions.pdfIn PDF document text
    • http://virixavop.epizy.com/top_chinese_songs_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5104 bytes
SHA-256: 8b46ff949c9adfcd9e7725610139318d6eeaf6223cc669a097e022946a2582ec
font_01_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 10864 bytes
SHA-256: fab31ba6e87b794714e46e08a8ab7c93e6ae6f614be30c620cf29cb8e0503a26
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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