Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91d74f163344608…

MALICIOUS

PDF

78.8 KB Created: 2021-02-27 10:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e8ba79c1da4d4b19f51e71286d109bc4 SHA-1: 80a7237b89d88afeb6bf15a7cf5e1accdd2ccdb7 SHA-256: d91d74f16334460826613c63775ef049bf4a748c7fbfb507a82cdf2ac35b8ede
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a keyword suggesting educational content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded malicious URL suggest it's designed to exploit users by directing them to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wix?keyword=preschool+classroom+observation+videos In PDF document text
    • https://cdn.sqhk.co/zepipawetopi/hehjjhe/54215680988.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jbzx6hj/nimedutefonuxebewe.pdfIn PDF document text
    • https://cdn.sqhk.co/dowotovewi/Ijhigpn/35779020093.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/jb7heih/angry_birds_transformers_optimus_prime_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/7CnidcQ/weather_underground_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zesafemumibow.myartsonline.com/guxataveduremuvikux.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/eia_weekly_oil_inventory_report.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/intel_core_i5-_4460_overclock_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/tenudibizuni.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/genichiro_boss_fight_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/64307787363.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/wuwosural.pdfIn PDF document text
    • http://girofili.myartsonline.com/99870831418.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/thematic_apperception_test.pdfIn PDF document text
    • http://lifarodanudu.rf.gd/89335564544.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/edema_pathophysiology.pdfIn PDF document text
    • http://xebowuruno.epizy.com/how_to_train_for_usmc_pft.pdfIn PDF document text
    • http://zanutebuxeboluv.rf.gd/1_metro_cuadrado_cuantos_milimetros_son.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 5168 bytes
SHA-256: bd09cd3a24034951351615f468c88774053e9a06504f8d1856d2d1c9759da2cf
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 10056 bytes
SHA-256: d77a6ebd3608c2cd58844228c89ecfef8ee6ad21da89afa2edfcbdeab357a20c
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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