Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0b59afea11b77c…

MALICIOUS

PDF

86.7 KB Created: 2021-04-09 22:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5dc88563db3d7918dc4a960c16553364 SHA-1: 2134bfdd7dfa477f76ad7f8653a9f776dc8ba7b5 SHA-256: ec0b59afea11b77cc7ca9d33cc9d7a8dba7a9e0291bd386f28a9409c27d15c92
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 0.9992

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://golowaki.ru/strik?utm_term=alpine+cde-sxm145bt+bluetooth+pairing PDF link annotation
    • https://cdn.sqhk.co/fedovipawe/zoPGOif/78556912251.pdfIn PDF document text
    • http://powerpoint4you.ru/linksys_router_ea6500_speedlbt13.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/KSjjXij/line_launcher_prime_apk.pdfIn PDF document text
    • http://ccckkkkk.space/anet_a8_printable_modsrs2ty.pdfIn PDF document text
    • http://storedubai.shop/collins_proline_21_vs_garmin_g3000tk732.pdfIn PDF document text
    • https://cdn.sqhk.co/buvoxinas/bUh2fwA/mifamifeg.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/jd6iKgg/26422243435.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/GA9Xwjd/peneloziwa.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/j5AK6ih/baking_recipes_from_scratch.pdfIn PDF document text
    • http://nosinoski.shop/6991589338j8sxl.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/hbogdhf/narcos_cartel_wars_mod_apk_offline.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://laletanegimiw.epizy.com/anticoagulants_used_in_haematology.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_bc65569f1c9c4f67b4fc19573e1a8584.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_ae626549b9e949e18c6cd4a0b4214706.pdf?index=trueIn PDF document text
    • http://dijutago.rf.gd/vomepofuren.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_f82c45f4bb354eda9b8ce32683a6739e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/blood_pressure_monitor_app_android.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_6db505edcd7041b8843758176f8889a3.pdf?index=trueIn PDF document text
    • http://tujevudaxuxos.epizy.com/legend_of_zelda_theme_song_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/42892001510.pdfIn PDF document text
    • http://pewafup.epizy.com/wepatobativin.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/doctors_note_for_school_template.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_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 2940 bytes
SHA-256: cc911cc81c196dad5939b16708050d3e222d8021bcee6753f1c87af5e67e62e6
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 5860 bytes
SHA-256: 5f324dea41e8d05b687b604dc80ba2d1889d61a312ec1e5459b09db2043fd409
font_02_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 10976 bytes
SHA-256: be8be5a16e85115f392096f276f3ae0eb980a61982e59c9a3da2eac79f2d62a9
font_03_sfnt_off00013d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D13 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3