Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd63ba30a244555a…

MALICIOUS

PDF

73.1 KB Created: 2021-05-24 02:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b0bcaa7cdeb2ddd7699153fa5dcb501 SHA-1: 540c604b5ad6cd5fb281aff4c145eb1d73c472a6 SHA-256: bd63ba30a244555af9a8bad9983d9a33e7499cec7bee9bca220474290c75eb72
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, suggesting it is designed to drive traffic to external sites. The embedded URL `https://jumiwimov.ru/strik?utm_term=what+type+of+oil+does+a+ryobi+power+washer+take` appears to be a lure, disguised by the document body's seemingly innocuous search query. ClamAV detection as `Pdf.Phishing.Trojan` further supports its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=what+type+of+oil+does+a+ryobi+power+washer+take
    • https://mutoxikaxinabab.weebly.com/uploads/1/3/4/8/134886861/33251144085.pdf
    • https://cdn-cms.f-static.net/uploads/4377647/normal_605ff069d7183.pdf
    • https://cdn-cms.f-static.net/uploads/4367656/normal_604b035d68b7d.pdf
    • https://cdn-cms.f-static.net/uploads/4452834/normal_600b24528e671.pdf
    • https://cdn-cms.f-static.net/uploads/4486200/normal_604fe3fc1faab.pdf
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/kowejas.pdf
    • https://zogetomobosuzo.weebly.com/uploads/1/3/4/7/134741576/54b7acf601.pdf
    • https://cdn-cms.f-static.net/uploads/4415304/normal_60464ac16b9d0.pdf
    • https://megidawuxuta.weebly.com/uploads/1/3/4/7/134729580/6846268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e4ef8435-4d47-4e02-9b09-7e525dca4737/romeo_and_juliet_act_1-2_quiz_answer_key.pdf
    • https://s3.amazonaws.com/lebejos/ieee_photonics_technology_letters_latex_template.pdf
    • https://uploads.strikinglycdn.com/files/3f2109dd-b5ad-4b91-8867-6bedb5fdbe26/3._my_system_by_aron_nimzowitsch.pdf
    • https://uploads.strikinglycdn.com/files/f35f9f41-81b0-4590-987f-3896df97d836/advanced_vb.net_programming_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/bc102768-dd7f-4220-81ec-23013533a382/mackie_profx22v2_22-channel.pdf
    • https://uploads.strikinglycdn.com/files/3abab266-5069-4847-bf4d-dd557011e2d6/kanso_sound_processor_cp950.pdf
    • https://s3.amazonaws.com/lunojol/backtrack_5_apk_free.pdf
    • https://s3.amazonaws.com/tidigudetefumof/force_and_motion_worksheets_answer_key.pdf
    • https://s3.amazonaws.com/xeroguru/metodologia_de_la_investigacion_sexta_edicion_uca.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/bidugurumavixamofigu.pdf
    • https://s3.amazonaws.com/wibadinavosunom/adobe_character_animator_32_bit_free.pdf
    • https://s3.amazonaws.com/lunojol/35246369828.pdf
    • https://s3.amazonaws.com/xofalepelala/damefalimuvonizol.pdf
    • https://uploads.strikinglycdn.com/files/ed3b0aef-dcca-4d49-8a11-2ae4a86af4f4/kenox.pdf
    • https://uploads.strikinglycdn.com/files/7f5dca8d-f4d0-451a-9777-69fb1ed6b585/what_are_the_best_certifications_to_have_for_cyber_security.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_off0000e02b.bin
0a03ad1db3cf57a8ab12bd38dcf8beb30193615db69780d47337405bf2709109
pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 5540 bytes
font_01_sfnt_off0000f318.bin
a760033e65b7a21197d808455e431701a0bee5e82a16c5062fbbe4a1930a0e53
pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10396 bytes