Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c44e71c08c971b9…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 19:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 85ba25f9bbb67ab034a8c1070df54915 SHA-1: d3939d6d21e63e40bacbced143fb8313869a5d3e SHA-256: 7c44e71c08c971b994d3240253d87f0f31c8e0d0f2fd167d7572cee043c7308f
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 external URLs, many of which are hosted on disposable domains or redirectors, indicating a likely attempt to lead the user to malicious content. The document body, though heavily obfuscated, suggests a 'TV program proposal template' lure.

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://leonvi.ru/strik?utm_term=tv+program+proposal+template+pdf PDF link annotation
    • http://jumbochecker.com/22235761618berkx.pdfIn PDF document text
    • https://cdn.sqhk.co/sojejinof/geFidMr/vozalabiselakopeselole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_600a6600f04ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_601cb5192b2f7.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/karekidijafolotutedef.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/37423687732.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/lazasuwemanikumical50.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/jcign7H/19886548730.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/butiruxukesakufuxoza.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/hahaRfu/zedge_free_ringtones_iphone_5.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/icamera_1000_firmware_download.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/tetofamuxulil/3d_engineering_drawing_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/63775610038.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/38369678579.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/bigelefupubora.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/wedding_invitation_card_templates_word.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_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 5372 bytes
SHA-256: 160baf4dbb19cf93548071c09e1d44a7ae0dd5639e25b4fd2db70c7583f988d7
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 10300 bytes
SHA-256: a4255310c018b766a14885a76b4e39882f6cbfa8f00b206dedc1ca916d54e209

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