Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d56efe56c72cfb…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 21:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d172b2f2b1701afc38230e64dc88c250 SHA-1: 9dcc7200e8d7b2e01e8a2eb77988bdeb7bf2445d SHA-256: 36d56efe56c72cfb0d6966a99dbc52337d34841b69495e3530d6ce00ff336d54
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=baby+bjorn+bouncer+cover PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484990/normal_6043e4c8442fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_6048a6b6e52f7.pdfIn PDF document text
    • http://tumerasiwabuzip.22web.org/54005214298.pdfIn PDF document text
    • http://xusinufazulu.22web.org/72138407788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385880/normal_5ffcb8ed66aca.pdfIn PDF document text
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/324317.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/8298006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6037b13af08ea.pdfIn PDF document text
    • https://javedaxefu.weebly.com/uploads/1/3/5/3/135314095/1ca868b6793508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5fcd261982edb.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://uploads.strikinglycdn.com/files/016faabf-400d-4eff-8c5f-6a3560806e08/if_a_guy_really_likes_you_will_he_come_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa173bb-b3f4-4e5e-b152-a127a0739484/maytag_bravos_xl_washer_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15202ad-9574-4df2-a5cd-a840ba8b28ed/what_is_a_shadow_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825f0ccf-f5d9-4ab0-8ecc-a2efd7435402/smith_and_wesson_standard_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a0f011-4fab-4d76-8ec1-4247883c03a3/words_of_power_and_transformation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb16769-f9fa-4ac8-bee8-0952de7ba785/96644840412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7590a971-c82e-46f1-a1c1-0b0045667fcb/sewof.pdfIn PDF document text
    • http://nupedapubamamu.epizy.com/27026531939.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/29393392848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4c24ba-e8d9-4e0d-9c4f-d1553461e29c/harrison_bergeron_by_kurt_vonnegut_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93107350-0462-4474-a7b4-086f2eb326fa/easy_piano_sheet_music_for_popular_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560a2d31-93db-448f-907a-41344ec83696/33450227433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ea9bb0-ddf9-46c7-8c19-93ac01603bd2/pipakovuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ced8c47-997f-420a-83e6-529be68b2b4a/why_is_a_function_odd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f80972-3d9d-4a85-821a-61cdbcc98bac/1269267189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799535a7-2583-4610-ad9a-8c8cb72b3b9e/first_alert_model_number_co1210.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_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 4764 bytes
SHA-256: e14901f8ea4011bef94af5c2cdd2d7fc04021e154e479ef3dc02c9854f33f3a9
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 12088 bytes
SHA-256: 3b7d68e20fc3642fb455dafbfeb16ebf7e892aafdf2eeb9fc127bdd531bb5b4a
font_02_sfnt_off000133aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2