Malicious PDF — malware analysis report

Static analysis result for SHA-256 834e6f36e04703e1…

MALICIOUS

PDF

87.7 KB Created: 2021-02-24 22:58:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 57e4fa3a53d1eb2209ddc5df3d0117d0 SHA-1: 8d05d877e6bfc9d95aaebc9dc555819219fa9296 SHA-256: 834e6f36e04703e18841811375f215a0475a0662fd6dfef211dcebd2d8677b82
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search engine results, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=weste+erickson+cause+of+death PDF link annotation
    • http://usacreditcheck.info/42846545582vwc32.pdfIn PDF document text
    • http://greenbike.shop/kung_fu_panda_3_full_movie_download_300mbh1a7o.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/permutation_and_combination_worksheet_with_answers_doc.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/bopubemigalozepubub.pdfIn PDF document text
    • http://9gusevshop.website/29717159493ruww7.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/who_wrote_the_quran_quora.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/tulilufewumagarapi.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
    • http://perexuwofogefo.onlinewebshop.net/sobajapimokide.pdfIn PDF document text
    • http://widifusi.myartsonline.com/captain_underpants_the_first_epic_movie_characters.pdfIn PDF document text
    • http://kakoxiji.rf.gd/awe_inspiring_me.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/himno_del_maestro_venezolano.pdfIn PDF document text
    • http://kopinakitiwodad.rf.gd/65003554831.pdfIn PDF document text
    • http://disorasejazamu.epizy.com/milady_esthetics_student_workbook_answer_key.pdfIn PDF document text
    • http://desetezovadu.epizy.com/87368055055.pdfIn PDF document text
    • http://rumajajoneder.rf.gd/icds_9_borrowing_cost.pdfIn PDF document text
    • http://werolalijatet.rf.gd/fundamentals_of_nursing_study_guide_9th_edition.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/mavusibozam.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 5036 bytes
SHA-256: 5bfe80dc9f010a57e8f578835786b1b6876082b5041f68e78470c752ba0f2ccb
font_01_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 10532 bytes
SHA-256: 47676f5887041935db4c3bb4a80068a85f6b77dea93007d37639612af7638f24
font_03_sfnt_off000142cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3