Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5a81fcf29026cf…

MALICIOUS

PDF

79.7 KB Created: 2021-04-15 21:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e84ef32c3347d468baa2804a3fb1079b SHA-1: 7347691ceff7a917ad58fdb68d07df4f28b55a2d SHA-256: 5f5a81fcf29026cfc3a59072517aa92330ed99d3dd496681e5aeda2885495111
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=honeywell+rpls740b+programming PDF link annotation
    • http://copytoshka.ru/81977250827fnvsw.pdfIn PDF document text
    • http://nukels.xyz/pirates_of_silicon_valley_720p_downl0gdj5.pdfIn PDF document text
    • http://perfectiona.online/vikutasanobcaose.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/Dgjiejd/konejadijanudal.pdfIn PDF document text
    • https://cdn.sqhk.co/novoganug/lhhhjpa/dunkaroo_oreos_2020_limited_edition.pdfIn PDF document text
    • http://amsidgi.xyz/ginifunotemotorxyto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_6034fe39eeddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_605f50a875a35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_60011cb1894cd.pdfIn PDF document text
    • http://leyloften.online/card_creator_for_crgcrg9.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/hg5xxyw/donex.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/rNvggjg/acordeon_hohner_apk_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/a9chflM/check_if_string_contains_substring_android.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
    • https://uploads.strikinglycdn.com/files/602f8ca6-8eac-4728-9c75-1c6d4bb5ff3a/fufuvebavesozupekixe.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/sad_poetry_whatsapp_status_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234b42c9-b91c-4f4e-99c2-80686b5f319f/anker_keyboard_bluetooth_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a32b5f-9c5b-49a0-9213-88df570a33f3/31694265609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ee8b70-66a4-4171-a52c-fa4351d9f9f9/wekitakosojeriromov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488d282d-241b-4ad0-91eb-0031e0b58348/lurozupebukir.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/what_culture_means_to_a_personification.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 4152 bytes
SHA-256: 46ef17ec9ccc7b3698bdeb153730a0aba206bbb5b859913ce0161e6f2d5543ae
font_01_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 5744 bytes
SHA-256: a81135ed0218e00a80bdf08a395bad3fbad50f8ee75189748506e154694dacde
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 11296 bytes
SHA-256: 7eaf11e2cddd67318b8987eab36aba086212d3e613e7d1272a69d79283f1ffcd

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