Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fec80e8471c8d1…

MALICIOUS

PDF

78.9 KB Created: 2021-02-27 07:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e2ad3a8464f31006fc9bdb100da3c39 SHA-1: 64b9665338f29ac3e7acdbe5bd5d4a348d87c0d0 SHA-256: 85fec80e8471c8d12806a461809be4375d32579ffdbd311d34c04b92293906d6
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. It uses brand-impersonation credential phishing. 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 0.9991

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/xipunufove.pdf.
  • 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://nipisod.ru/123?utm_term=how+to+log+into+ubee+router PDF link annotation
    • http://rixorevu.getenjoyment.net/how_to_name_your_best_friend_on_snapchat.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/xipunufove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_601dac2160cb4.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/e07186fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_6031d15a6242c.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/how_to_calculate_average_temperature_of_earth.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/tupepowejib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456140/normal_5fcfa26ce4d78.pdfIn PDF document text
    • http://limelusefi.iblogger.org/13260253922.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/d077e6fcb6e9b58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448323/normal_5fd176e0a9145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427544/normal_5ff674d12f89b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fcc48ad1dbbf.pdfIn PDF document text
    • http://rorureferujuraf.22web.org/imanage_work_9_user_guide.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/vibakumopamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5fdf8ec4264d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_600cca33556cc.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/8021025279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sosozodazu.epizy.com/sikeberudubaga.pdfIn PDF document text
    • http://pipovafalalum.rf.gd/acc_travel_assistance_form.pdfIn PDF document text
    • http://tukudizu.rf.gd/highways_england_traffic_reports.pdfIn PDF document text
    • http://bokonejedebi.rf.gd/english_grammar_book_class_6.pdfIn PDF document text
    • http://favavobebin.epizy.com/power_battery_app_apk.pdfIn PDF document text
    • http://kifugelewepin.epizy.com/brawl_in_cell_block_99_soundtrack.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_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 4656 bytes
SHA-256: 072b21f3ac443e897e1063be62ec167e2aafa495f1c4c6532963412b588d1bbf
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10592 bytes
SHA-256: 2f2d1808b69d265c430005affea7d4e1a9dbcaa24fdd5690321563a6c36df7a9