Malicious PDF — malware analysis report

Static analysis result for SHA-256 557128484513e282…

MALICIOUS

PDF

80.7 KB Created: 2021-04-14 00:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2361142657972fc0724a9a4d54d8bb6e SHA-1: d45d29c5afcd55deedfb63064b0a2ebf7f7f3568 SHA-256: 557128484513e28282bf4aa4420a6bf504a2e9430021471ca3a50ddf89c38301
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains references to 'Psychological assessment sample questions' and is associated with external URIs that are part of a link farm on disposable hosting. The primary malicious URL identified is https://pelibifir.ru/strik, which likely serves as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=psychological+assessment+sample+questions PDF link annotation
    • https://cdn.sqhk.co/rosivapixove/uigT5nE/whatsapp_desktop_apk.pdfIn PDF document text
    • http://it50life.pro/multiwii_setup_quadcopterdppdi.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/vototofatoxotugiwabem.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/ORghrjd/red_tone_neutralizer_shampoo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_604670a1f0ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_60374f55e8aa6.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/hhguKVd/terminator_dark_fate_cast_edward_furlong.pdfIn PDF document text
    • http://dress-russia.ru/install_guide_wordpress_plugin_without_ftpqg0r6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_5ffa091143252.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5ffe32525885c.pdfIn PDF document text
    • http://wrestling-mma.com/974731853331qdfi.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
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_bd7eaf43e45447058e1143c53168b0eb.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_caf6e72eedc540108aed0f3e8bc58878.pdf?index=trueIn PDF document text
    • http://delorikafuba.rf.gd/all_rounder_songs_naa.pdfIn PDF document text
    • http://ferumodos.epizy.com/analytical_reasoning_mk_pandey_book.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/bofejomito.pdfIn PDF document text
    • https://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_aa8cddb1501548648d3a4bb36bf52dc6.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_1bad0a1cee5a4d11bd7624c37d1e55df.pdf?index=trueIn PDF document text
    • http://dusiwesidixe.epizy.com/49758478282.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/36977573850.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_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 5360 bytes
SHA-256: 1a8eb7ff1451291a8c79bd25dc2cbdcc4966b8d5d78ceccc36c34c580792c636
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 11452 bytes
SHA-256: 6fa629fda9051dded4a89c77328aa1eaec0eb037c765fb0b908406ad9f3a279c
font_02_sfnt_off000126f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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