Malicious PDF — malware analysis report

Static analysis result for SHA-256 618bd371fa6e79aa…

MALICIOUS

PDF

77.8 KB Created: 2021-06-05 17:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb05025ac7011c3d6f2ca7278a7e6d58 SHA-1: 1e79d9796000e5bcd292a24a70943e1ab65fe2c9 SHA-256: 618bd371fa6e79aa4accb7cc338cd21b607649e7c60a8dd1184df471b341f6a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://xajibur.ru/123?utm_term=bjcp+guidelines+porter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472775/normal_60328e11639b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_6031f5f539f63.pdfIn PDF document text
    • https://wadomojare.weebly.com/uploads/1/3/4/4/134472746/pesebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472188/normal_606920449d4a9.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/kipesapiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fd08566bb2df.pdfIn PDF document text
    • https://zufuzizulilok.weebly.com/uploads/1/3/4/7/134702460/kavakiritagap_tutoluwukutimog_tezasufufose.pdfIn PDF document text
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/2053016.pdfIn PDF document text
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/mebunitorejakibokak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144439566/27770311110.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144606222/kipasodivenokaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39eadf9f-98f0-44e0-ad4a-8fd5e5a0df56/bilefusanepaxixidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1bbe4e-190b-4a44-b22f-7a59f357dc6c/vabexobovubik.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144453162/laboratory_experiments_in_chemistry_for_health_professionals.pdfIn PDF document text
    • http://kafunujazuwo.pbworks.com/f/jumapumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb347255-d639-4946-9809-ae29a2845c42/2136340196.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/love_island_season_2_game_guide.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/jeepers_creepers_3_movie_tamil_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4e40e2-ca8e-4609-b467-d29715a151a0/how_to_calculate_gdp_per_capita_growth_rate_percentage.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144652947/does_fios_need_a_modem.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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 5156 bytes
SHA-256: 0c091bcd2ef1c750d2b9f2fcae173d591b9a554616592f8660a722957d79cea5
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 11288 bytes
SHA-256: 46332f832793efc07304f7dba8a36a3bcc988b2cd3cbf5fefb0e5262645258ca

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