Malicious PDF — malware analysis report

Static analysis result for SHA-256 99792f0d30bdc958…

MALICIOUS

PDF

68.8 KB Created: 2021-05-08 19:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e8c748c86ec5bd02d34c8858fcbc1d55 SHA-1: 6a4b87cba9a1ee98579ec39ed2282aeecdedb4f8 SHA-256: 99792f0d30bdc958206a87957ac77e64bd88c7c948e3625be7c485cec50fa10c
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'information systems engineering' which redirects to various unknown and potentially malicious URLs. The presence of multiple disposable hosting links further indicates a phishing or scam attempt.

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://druttle.ru/strik?utm_term=what+is+information+systems+engineering PDF link annotation
    • http://webcam-model.online/top_100_selling_drugs_2020skn36.pdfIn PDF document text
    • https://zazuxari.weebly.com/uploads/1/3/4/3/134319397/dofijujemiwi_fogotefotivem_tusipujidew_geropox.pdfIn PDF document text
    • http://titanovyi-filtr.ru/sokozagupabasufenosj2gm6.pdfIn PDF document text
    • http://habercigo.com/pigeons_attack_apkue6v3.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/8662110.pdfIn PDF document text
    • http://pesale.pro/74091854085g8tx1.pdfIn PDF document text
    • http://marketitaly.pro/silizovinupegejubozuxebu5dwbn.pdfIn PDF document text
    • http://czecheducation.space/mirukazusagonavufuvatoros4sp9h.pdfIn PDF document text
    • http://1s.london/9977196754hshq8.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/kazogibolifidadedevolexom.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/9667635.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_69818186a2bc4c20971c4cd1a1b07b5b.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_da11753c559d4e5c9d706f7487b54ebb.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_4dfbef4a65644e85b4d26be928c4adb1.pdf?index=trueIn PDF document text
    • http://dopovis.myartsonline.com/how_to_reset_toner_cartridge_brother_hl-3170cdw.pdfIn PDF document text
    • http://buremoxosolubu.epizy.com/data_analytics_made_accessible_free.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_6d8353a48df14b119e59743d83d1076b.pdf?index=trueIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_5b0d95477f23483485eacee1ae6d3cf4.pdf?index=trueIn PDF document text
    • http://pabixezo.rf.gd/benefits_of_entrepreneurship_education.pdfIn PDF document text
    • http://legatuwaw.epizy.com/dell_precision_m4800_battery_not_detected.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_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 5264 bytes
SHA-256: 8b1dea616ca6aaebab16f39b8819d79f4905a11a03f9a83bf8da35cec3c47ee7
font_01_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 10252 bytes
SHA-256: 6d33c5ad8f75570fa385cd0ae6d44e65f90b3e2e587db1f66e826477d6faf7ae

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