Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5fa3b1057d29c9…

MALICIOUS

PDF

74.2 KB Created: 2021-03-21 06:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead733e345b7fe926920d5ecfeba9c11 SHA-1: bb6faa97d0c373d4b29d28e018438ab2639b9ab1 SHA-256: ab5fa3b1057d29c9371596943a43368adc0e52a557ca48bd12e76446f2341d92
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a malicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'Blink book summary app', which is likely a pretext to drive the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=blink+book+summary+app
    • http://pubgmobiie.com/angularjs_directive_attribute_without_templatexoe6h.pdf
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/3b1ffc1fa.pdf
    • http://greenbike.shop/is_value_premium_dead9grxt.pdf
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5fe83ba108890.pdf
    • https://cdn-cms.f-static.net/uploads/4408596/normal_600febaa83cac.pdf
    • https://cdn-cms.f-static.net/uploads/4446401/normal_604aba05d8db4.pdf
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/4617362.pdf
    • https://static.s123-cdn-static.com/uploads/4367916/normal_600193bf842cd.pdf
    • http://susadaxaxavotij.22web.org/roxof.pdf
    • http://reestr.site/exercice_prefixe_suffixe_radical_imp1d4ou.pdf
    • http://dinabosovub.iblogger.org/what_is_victoria_justice_doing_nowadays.pdf
    • http://kovamuwaropepu.getenjoyment.net/pipetedeti.pdf
    • https://cdn-cms.f-static.net/uploads/4413703/normal_60265e9bb8ec6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sanugifop.atwebpages.com/what_is_the_best_battery_float_charger.pdf
    • https://s3.amazonaws.com/rumezo/english_conversation_class_ideas_adults.pdf
    • https://s3.amazonaws.com/gurafoga/google_assistant_free_for_pc.pdf
    • https://s3.amazonaws.com/jawusawar/5337209657.pdf
    • https://s3.amazonaws.com/solonebosop/82493035374.pdf
    • http://sitafefisoju.atwebpages.com/dish_network_channel_guide_local_channels.pdf
    • https://s3.amazonaws.com/fedufiporara/24430979585.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e361.bin
8d6ca782e199873be9eaed5c02f2be291cec4f8e4562e82c5c31ce9ae02baaac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5320 bytes
font_01_sfnt_off0000f564.bin
849907f42e7bf6a128df7066928c1af30ddb2f8061ecc12cbb02af9a5605bfa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 11016 bytes