Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f89c331a6161aa1…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 16:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf49194d993ff4fe901cc817e828e696 SHA-1: ebad6b1b6173af1be681cf7a23a382a73770fd7f SHA-256: 3f89c331a6161aa1c42debcab13270ab73e845e1bb0f8176bc3780b87619e4be
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=stihl+fs+130+carburetor+adjustment
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/5836527.pdf
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/65303addd.pdf
    • http://sekejibugu.iblogger.org/how_do_i_connect_my_turtle_beach_headset_to_my_pc.pdf
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/betatenalexinu.pdf
    • http://mizigigutafax.iblogger.org/74055718188.pdf
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/netoxa-taxebukurizow-romajisa-kefonaxazawij.pdf
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/eaf4e8a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_d6ec7d42c52340da98730568fb948974.pdf?index=true
    • http://xatenekoroxaju.epizy.com/73468809597.pdf
    • https://s3.amazonaws.com/zukogi/21133271219.pdf
    • https://s3.amazonaws.com/xotomisen/41788413205.pdf
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_3407f074f2f34ad4b0a377168376041c.pdf?index=true
    • http://tinulelor.rf.gd/cable_tray.pdf
    • http://bewimovope.epizy.com/fusubowerumopukepipon.pdf
    • https://s3.amazonaws.com/natewared/non_communicable_diseases_worksheet.pdf
    • https://s3.amazonaws.com/xanunafojuloki/bomgar_representative_console_for_mac.pdf
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_412b412a64fc49899d4bb085dc90238a.pdf?index=true
    • https://s3.amazonaws.com/xabalaru/frp_bypass_apk_5._0.pdf
    • https://s3.amazonaws.com/zakunafu/pesuras.pdf
    • https://s3.amazonaws.com/jedobufudajewu/3087902057.pdf
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_c08ab551d15b431ea9ecf1525902dd41.pdf?index=true
    • http://rifepegagitajip.epizy.com/zulezusovijaf.pdf
    • http://bixitodofotav.epizy.com/18251100686.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea83.bin
9091f92afa6aafabd5de34074e492b09ec9861497133bd22c01cb21ed9c31e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 5940 bytes
font_01_sfnt_off0000fe94.bin
2e29aa763df60cccb791e062e9fa1db2977327d3e257bb87c272dad9b65e4618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10296 bytes

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