Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84b6dfce370e6f6…

MALICIOUS

PDF

74.2 KB Created: 2021-01-19 05:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba07d5e227538ae4e974e5992c455d5d SHA-1: 71d3f6bab1caf816594bd687d68f8042b6e1c59d SHA-256: e84b6dfce370e6f6fd5d76ef976b65fff2822c99d0f39998e55308d2596c0eba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically referencing 'american airlines 3217', suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and URL heuristics point to a malicious document designed to trick users into visiting external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=american+airlines+3217 PDF link annotation
    • https://site-1177523.mozfiles.com/files/1177523/subway_princess_endless_royal_run_download.pdfIn PDF document text
    • https://site-1167994.mozfiles.com/files/1167994/free_online_pop_music_radio_stations.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5ffdeb06a8fee.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/jomukirenetalezatobi.pdfIn PDF document text
    • https://cdn.sqhk.co/vugujebeku/aAghdog/govisifakin.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/Mijgijb/residential_electrical_symbols.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/sufiranagor_tiwanegu_mebidunipebejup_tulujikolirufal.pdfIn PDF document text
    • https://site-1168098.mozfiles.com/files/1168098/48348775736.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/1c3a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fd05e1728a2c.pdfIn PDF document text
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/pefakos_pafakos_muzujimikero.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/ihhigy2/granny_hack_apk_mod_menu_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefebewo.epizy.com/typhoon_ompong_information.pdfIn PDF document text
    • http://kapivuvarebe.rf.gd/43833159386.pdfIn PDF document text
    • http://tununik.epizy.com/azur_lane_alabama_gear_guide.pdfIn PDF document text
    • http://zatunikepozis.epizy.com/bleach_ost_2.pdfIn PDF document text
    • http://lufirapubabe.epizy.com/gijorebevunola.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_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 5364 bytes
SHA-256: 10541b188cfa8c4a7d39758978405ac35d3d476b7a99ed8850678cf31c23f57f
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 10828 bytes
SHA-256: 78871045139de53a5c7da5ad02527c8f35c8301b49c2b38b7ec74fcff48b6ab5

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