Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87b1f781b6a7279…

MALICIOUS

PDF

125.2 KB Created: 2021-02-25 00:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 99931f704ebe0841aeba787a55e65f3a SHA-1: 1a152b73f657941ba9e188cd69e914bea1952939 SHA-256: f87b1f781b6a7279adc5b385a8dd1a774600732a32b703e8daae17af28889a0b
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically referencing 'petsafe bark collar spray refill', suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/strik?utm_term=petsafe+bark+collar+spray+refill PDF link annotation
    • http://inscarusa.info/82161820590me41f.pdfIn PDF document text
    • http://azules.ru/82162401521sk5t0.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/kogazumeletenowozejidopoz.pdfIn PDF document text
    • http://neo-tp.ru/position_distance_displacement_works8e5a1.pdfIn PDF document text
    • http://natbeach.space/winchester_model_94_rear_sight_bladensf9s.pdfIn PDF document text
    • http://menbp.online/cloudformation_s3_bucket_parameterkaxrl.pdfIn PDF document text
    • http://artemk.ru/fovusoj937fw.pdfIn PDF document text
    • http://totufozumad.iblogger.org/mindathedi_kuyile_song_free.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/how_to_program_a_chamberlain_garage_door_remote_953cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retisovojor/material_design_android_bottom_navigation.pdfIn PDF document text
    • http://nefijojutofad.rf.gd/capitulo_1a_actividad_8_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/35864457874.pdfIn PDF document text
    • http://bopufadepop.epizy.com/event_backdrop_design_templates_free.pdfIn PDF document text
    • http://sadigibesalij.epizy.com/null_zerep_granny_mod_menu_1._7.pdfIn PDF document text
    • http://luwiworim.epizy.com/broken_heart_boy_image.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/aegisub_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/pomukixupixagelu.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_off0001abf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF9 5316 bytes
SHA-256: bbb4cf192ef13b26e0d30671a1c055a529052cc8350ec966594b6985a2ddb53a
font_01_sfnt_off0001be2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE2D 12264 bytes
SHA-256: b94d1f184ef29dbd63be9d0eec7f469c446df8c9e51abbf25611161fcfb570ef

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