Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc51a0f24c661b5…

MALICIOUS

PDF

82.3 KB Created: 2021-02-05 20:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 740921e8d25dc343f943ea0fd6d65846 SHA-1: 96bec00b0cdc013077daa35779b5c59133ea5fe8 SHA-256: 5cc51a0f24c661b50ab591913982f9a9d25b7457849a1fdcbf666d95b77fff41
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/aws?utm_term=android+vs+iphone+sales+chart'. This indicates a phishing attempt to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/aws?utm_term=android+vs+iphone+sales+chart In PDF document text
    • https://cdn.sqhk.co/boguzivipel/hhgWie3/name_creator_for_free_fire_app_download.pdfIn PDF document text
    • http://circulshtangcalip.website/detobebasexebodezazikawankr0h.pdfIn PDF document text
    • http://fanegasubi.iblogger.org/gokexuniwesorimazuja.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/f2hhhd8/bcg_campus_events.pdfIn PDF document text
    • http://pedron.fun/lokofezoljb7l1.pdfIn PDF document text
    • http://fopesekebamit.22web.org/sumuveputuzuzasebowi.pdfIn PDF document text
    • http://allrecipes.pro/wheel_size_bike_computeruxusj.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/cfhbN3m/forest_bubble_shooter_review.pdfIn PDF document text
    • http://rineset.xyz/92520966758hrdp5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366978/normal_6004f44c373cd.pdfIn PDF document text
    • https://cdn.sqhk.co/wevosevob/ijfha1y/mijapokezuremikukasobi.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/wiremeresegikon/81205490805.pdfIn PDF document text
    • http://difuxifomag.rf.gd/sapibedajelalu.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/arsene_lupin_vk.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/autocad_lisp_basics.pdfIn PDF document text
    • http://kiwozoma.epizy.com/bazusozuditipi.pdfIn PDF document text
    • http://fuxefav.epizy.com/gnomon_workshop_tutorial_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/kidavekamirel.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/vevirikapepivojexoluv.pdfIn PDF document text
    • http://zusobudem.epizy.com/candy_crush_soda_apkpure.pdfIn PDF document text
    • http://fukijudetoj.epizy.com/2_player_chess_no.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_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 5208 bytes
SHA-256: c3aee5c641856ee232f07ab5428906e8d983f9649b929885150d0fbce3385fef
font_01_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 11372 bytes
SHA-256: 168f3b011ac936c52eb728507e8ce55913a140a7896d295b9cb7c523ab2be0f5

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