Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff6fc9e57dcdba5…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 04:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 371eafa3a3ef12cd0e5860cf606033ff SHA-1: a6cc4b79a7422bf935272a9312cfb8ce587169e6 SHA-256: fff6fc9e57dcdba55f750162a87b1cbdb2969bd9fdd14c469c7ac9595c984b8a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one that mimics a search result for a common technical query, directing users to a suspicious domain. The PDF structure and embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=how+to+connect+samsung+tablet+to+bluetooth+keyboard PDF link annotation
    • http://nuzarekuzugav.mypressonline.com/pufut.pdfIn PDF document text
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/kizagexuguzoru_faduwuxaxilu_kamar.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/el_himno_nacional_de_honduras_y_sus_7_estrofas.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/6dac43037e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_601c980a4008b.pdfIn PDF document text
    • http://xuwivezotuw.22web.org/slingbox_500_setup_with_xfinity_x1.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/fixed_moving_average_tableau.pdfIn PDF document text
    • https://tepaxomiro.weebly.com/uploads/1/3/6/0/136019937/8973220.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/xirewinizono.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/98825233104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_604d2c61c884f.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/aquasource_bathroom_faucet_cartridge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigukesege.epizy.com/81399283757.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/bootstrap_modal_form_w3schools.pdfIn PDF document text
    • http://fejonaxi.myartsonline.com/calcutta_university_commission_1917.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/curse_of_strahd_reloaded_krezk.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/dating_application_form_girlfriend.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/84767753517.pdfIn PDF document text
    • http://momerulazem.rf.gd/bullet_basya_movie_song.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/marginal_utility_theory.pdfIn PDF document text
    • http://derarav.rf.gd/77184235730.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_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 5712 bytes
SHA-256: d134402785e434e79161a84599d8070fbbbddb232e9f259161cab91bb5593e0d
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 11228 bytes
SHA-256: 052c5be1c3db61c4c7eaf32113c2ced2311063e0e156fe6b72a59bcac7f13d50

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