Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83cfa2e8fe51be4…

MALICIOUS

PDF

69.3 KB Created: 2021-02-25 00:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4ddff740e6af983931663c43581feb59 SHA-1: cdc55c9c0d35b04bbc686d0f1673838452021267 SHA-256: c83cfa2e8fe51be4df69ff31c720c234fbba0ef92c711e1ac501736fb656d9ca
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'crochet hat patterns' to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=super+easy+crochet+hat+patterns+for+beginners PDF link annotation
    • http://lebizifijafaxim.medianewsonline.com/gakutasapapodarofimuk.pdfIn PDF document text
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/6983412.pdfIn PDF document text
    • http://ogranicbio.fun/zokipezixinedebufagiwem04oxg.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/holy_quran_application.pdfIn PDF document text
    • http://7lessons.space/certificat_de_cession_de_vhicule_allemands58mk.pdfIn PDF document text
    • http://sanezukevuzav.iblogger.org/dark_booter_free.pdfIn PDF document text
    • http://kirudina.iblogger.org/55375380519.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/gaxuremewuger/android_version_pie_game.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/business_vocabulary_in_use_intermediate_book.pdfIn PDF document text
    • http://fiwimawa.rf.gd/tercer_convenio_de_ginebra.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/aescrypt_for_mac.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/rolajipobapavufugolugox.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/57638188075.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_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 5592 bytes
SHA-256: 84fd4620bdb41666214a39afc79784182b25784c83975aa4c41cd06c24748d40
font_01_sfnt_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 10476 bytes
SHA-256: 0235c7837b757552c3727a4e4b94c78d4fbc49de70e118207fd1563916f1a8c1

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