Malicious PDF — malware analysis report

Static analysis result for SHA-256 262e57752872f692…

MALICIOUS

PDF

83.4 KB Created: 2021-05-09 00:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17f77332d0c067b338ea2e83e8465c86 SHA-1: 9df9c78c9a11adec61bb3924e6e8c13a863688ad SHA-256: 262e57752872f692c2263a76c38fac430c4fa2de031d32740f12b7b74898f294
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 0.9967

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=power+pressure+cooker+error+code+e1 PDF link annotation
    • http://ritixibetono.mygamesonline.org/gekifakewigorinene.pdfIn PDF document text
    • http://zinifezabi.iblogger.org/70249851498.pdfIn PDF document text
    • http://larumutul.getenjoyment.net/christmas_cello_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5fc977c9d04e4.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/97827191494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_600a4f0308f01.pdfIn PDF document text
    • http://rufowanojona.22web.org/radical_acceptance_tara_brach_audible.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6017229774c45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabipinipimano.epizy.com/how_to_fix_astro_a50_mic_cutting_out.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_f455fd818e25465f988d64d9e400e2af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa19d1ec-b05b-464d-839f-4321ae35398f/olympus_e-500_instruction_manual.pdfIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_34707e72dee64b63bceef874d803286f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f57ff3b-845c-470b-8869-0a8143c826ab/duluteguvazutemunad.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_db74c29f15e147f7afbc274171cb9388.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62759b8-e5f8-41d1-8917-8cbc4ce862bd/lifufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0a3035-9ca3-44ea-b918-626569f28f62/lulol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90b7c72-bbdf-4ece-90dd-8ca864b0453a/pituwobipiruruxem.pdfIn PDF document text
    • http://talaxevavilur.rf.gd/lettering_templates_for_applique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db91db2-e290-4973-8b5c-1aef76659305/pukedikanoxosim.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_56124c6a3c86425d843a61dfc7243390.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f869ed-9c55-45cb-84d4-0b1ee62b9c67/honda_125cc_2_stroke_dirt_bikes_for_sale.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/9689677664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3979f98-620f-43a8-a80c-34eb46a26b48/50303213899.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_2b36d7a2f16c4115a5e15947d9871686.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/287c5417-ddd6-4c44-bb4c-d86cd2da5e6f/how_we_got_the_bible_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f897d9-3b14-4f5d-bd44-eaa4c1ebeb6e/introduction_to_quantum_mechanics_solutions.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/amendments_1_27.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_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 5036 bytes
SHA-256: c3b29bba1840eacde8260288255f7f91504f50e7d2c900c3691e2b2c73e56af3
font_01_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 11656 bytes
SHA-256: 7a0ad42d8b988a32c828b91dfa1d84b86defeea7bacd3ebfe1597410d13f28ea