Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff139281940b755…

MALICIOUS

PDF

83.4 KB Created: 2021-02-23 23:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ac00deedcf2356bb518a26fb55c6a07 SHA-1: 7663e29524c86d143ce44426fbda6b3a2ea7488a SHA-256: bff139281940b755fc5cadab693ab3de750cb155af51044e55b2103ee51411a0
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 URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to reference appliance reviews, suggesting a lure to trick users into clicking the malicious URL. No scripts were extracted, but the presence of an external URI points to potential redirection to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=bosch+800+series+compact+washer+and+dryer+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5ffe20fbb2081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5fd7af5eb7e78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_5ff8bac864a83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_601deac433dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_602ec386e421e.pdfIn PDF document text
    • https://cdn.sqhk.co/zezaxemepe/hjghdsp/5715340063.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/If6jhgg/63171492268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5ffcfcc94a9ac.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/eTCfgjE/36097682495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5fe66ff059ab8.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/3ILhigh/can_knockdown_2_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajeladegafu.epizy.com/punujetofona.pdfIn PDF document text
    • http://xefujexomige.epizy.com/algebra_work_word_problems.pdfIn PDF document text
    • http://mikobiduvug.rf.gd/cardiac_enzymes.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_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 5920 bytes
SHA-256: b9e59b7aa541b259c7a767d24e8cbf72ccca89857bba97d926a14accb920dfb9
font_01_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 11368 bytes
SHA-256: 9ba9635362cbd09237e6b8ed32650891258cd71062d4c25f1cc4cc6f0eaffe46