Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc7315c5d415ed0…

MALICIOUS

PDF

70.3 KB Created: 2021-03-28 15:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bfb724a00730f6fb6cdf932758e4c310 SHA-1: 1721dc016331c8712aea1d707360955588919071 SHA-256: 8cc7315c5d415ed0d60f2beaed7a2603d58ec9803e548b27279fdc6f04670d8a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/123?utm_term=gruffalo+worksheet+pdf PDF link annotation
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/357958e5dafb0a.pdfIn PDF document text
    • http://usejus.pro/realtek_hd_audio_manager_not_starting_upf384d.pdfIn PDF document text
    • http://legendnat.space/garrett_gta_500_manualz14ku.pdfIn PDF document text
    • http://podarokinsta365.site/26771275779vux7o.pdfIn PDF document text
    • http://krepezh.guru/the_five_love_languages_book_depositorykwlww.pdfIn PDF document text
    • https://cdn.sqhk.co/fotajoge/hcNwtRF/morugiso.pdfIn PDF document text
    • https://milorali.weebly.com/uploads/1/3/5/9/135965765/nilometevotitif.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.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
    • https://s3.amazonaws.com/tobito/minecraft_tokyo_disneyland_map_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/wogudokuki.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/android_nexus_one_wallpaper.pdfIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_375fb3350672499bb847f8ee69105580.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_e122f96b23e94a85ac2a9e4fb486637b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/januwofobitetora.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/32167546567.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_1c431ceb7e3142fa8fa8515dae227f47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/transformers_1_autobots_arrival_to_earth.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/50555030919.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_off0000c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 5044 bytes
SHA-256: bbda9568ed3ab2ea9c90dfd67ca4fb838444ad94496de9e25ec947d75aa691c6
font_01_sfnt_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 10148 bytes
SHA-256: c8fc0104a34312cd6ecb032b3c9fe2baf927144eead671ba043c6702e4fa09b7
font_02_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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