Malicious PDF — malware analysis report

Static analysis result for SHA-256 679df73e9012c662…

MALICIOUS

PDF

148.9 KB Created: 2021-05-06 21:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 591d0f0e3dc8bb4049d941c51ffe9fc2 SHA-1: eb004ffe6965fa7be48ce3aa47aaf127e1180c5d SHA-256: 679df73e9012c662ddc52f1425bf5f3aacdcb5c59a0af3ba285957f8162e6010
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent link pointing to 'https://midufefew.ru/strik?utm_term=awol+opm+guidelines', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text fragments that may be part of a lure. No scripts were extracted, but the presence of external links and the high confidence detection indicate a malicious intent to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://midufefew.ru/strik?utm_term=awol+opm+guidelines PDF link annotation
    • https://cdn.sqhk.co/lozuzupadis/z7vibz1/5_pin_bowling_kingston_ontario.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/jd2hauz/57307515463.pdfIn PDF document text
    • https://xefozevinunakab.weebly.com/uploads/1/3/4/3/134340699/pukovix_fagobatipijerin_vekelubo.pdfIn PDF document text
    • https://guxafosiwu.weebly.com/uploads/1/3/1/4/131453681/7942354.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/icvEic0/whatsapp_app_play_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_602f605497a23.pdfIn PDF document text
    • https://cdn.sqhk.co/givefugonuw/V9ijWje/59097364617.pdfIn PDF document text
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/nojopapejuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/XyXJH0Z/hatchimals_colleggtibles_tropical_party_playset_season_4.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/04254766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_604e15c39de1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_43ae8878cc614ae598b85da0e2fdaf1e.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_0256b3d642dc44a3ab92e04880169819.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_fe328cda9fe0467aa300d531819391a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c42fbf-9c8b-47a0-886b-5e37d9333b5e/delonghi_dehumidifiers_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6853a1-58d7-4c3a-b115-ed997541d601/29001488138.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_05fce09fb6384a86a12081181e36f89a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4304f640-ad81-4666-8f71-98ae8a00c374/mid_america_oireachtas_2020_live_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8eec43e-f7d0-4be2-b76c-a219ac22d01c/nugefinewetigojag.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_dda51e10b59d4f2289c577c6cb8e58fd.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_1fbfd675797b46339ca90117635fbf7d.pdf?index=trueIn PDF document text
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_0a00dcdfa0794c34820c6019b5f4b918.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F214 5052 bytes
SHA-256: e07157e34e2b8b10fd4f71946a1a1073c1a2880b46fa31f8ed9eaa8da75972cb
font_01_sfnt_off0002034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2034E 11096 bytes
SHA-256: b97d2bda570001cc8171930eb33acdbfd322332aec0d4763e81f8b99de1a4103
font_02_sfnt_off0002294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2294D 18028 bytes
SHA-256: ccd9a928ef2674c60e6352a5a6d7a379b064d77ce179921242e81ccc684f029c

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