Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a3bc3423062165…

MALICIOUS

PDF

87.0 KB Created: 2021-05-18 10:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ff7a16d2f5b5319c681c05735c2bb10b SHA-1: d467e9e8ba5b35aa49d9ebda3a80efe98f1f34a2 SHA-256: d1a3bc342306216536050cd8cc3c9403d6e276374f291c4b2823cdddc4fc0724
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or phishing page. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=breve+resumen+del+libro+el+secreto+del+hombre+muerto PDF link annotation
    • http://japuxikuwef.iblogger.org/antropologia_definicion_segun_autores.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_6028f0c754520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_601f2baba1885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_606c15263bb63.pdfIn PDF document text
    • http://rinetiwirejux.iblogger.org/on_writing_stephen_king_rhetorical_analysis.pdfIn PDF document text
    • http://wulebiful.iblogger.org/horror_full_movies_english.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/godoremitiwuja/94554006035.pdfIn PDF document text
    • http://nanefelizili.epizy.com/the_new_national_baptist_hymnal.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/what_is_the_best_toaster_oven_for_toast.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/schwinn_airdyne_model_comparison.pdfIn PDF document text
    • http://xaduvegovoz.rf.gd/maggianos_reheat_instructions_lasagna.pdfIn PDF document text
    • http://tipewonapifaguf.epizy.com/french_grammar_lessons_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/new_bollywood_horror_movies_2019.pdfIn PDF document text
    • http://nekajabosad.rf.gd/waxovuzizusedilitiwapawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f1f13c-f297-4e29-b83e-4b352f0b8d68/74698838886.pdfIn PDF document text
    • http://gowegonuma.epizy.com/chainsmokers_closer_live_performance.pdfIn PDF document text
    • http://wewonak.rf.gd/chemistry_handwritten_notes_for_upsc.pdfIn PDF document text
    • http://kokabine.rf.gd/auto_electrical_diagnosis.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/77552774549.pdfIn PDF document text
    • http://vananoxozonu.epizy.com/41871644680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5224105-7697-4f42-af4e-69b87db194d1/nikupopop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d792121-d744-4a6c-ac11-519f6e9693f3/kubuxigip.pdfIn PDF document text
    • http://tivanebizogosa.rf.gd/41898233483.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_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 5216 bytes
SHA-256: d1cae69eedf4ea5f6e4041bb52cc741cb5adfc3df90ec3ef09c00df07b960fa1
font_01_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 11588 bytes
SHA-256: dd3c0a13e5fbba0efb499497f1b5a3c7bd347b3c960c0676189b36bf8bf1256d

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