Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5d454de9d0449c…

MALICIOUS

PDF

71.0 KB Created: 2021-02-12 06:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4eb3f7c7151260c6b97af4873725de43 SHA-1: 1317df007fb39d058b031e9a3f5d1afd12436cfa SHA-256: 4b5d454de9d0449ce492796c2420da03d5bd3983b043dc7abd671673aabd7170
224 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://yafferge.ru/123?utm_term=child+depravity+theory In PDF document text
    • https://cdn.sqhk.co/melipetoluf/cjdGTOH/maricopa_county_recorder_forms.pdfIn PDF document text
    • https://lewaxirilukuxod.weebly.com/uploads/1/3/0/8/130813115/nuxibotedufaz.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/race_io_game_video9d862.pdfIn PDF document text
    • http://coolvdomaion.online/sims_4_fishing_guideseuhh.pdfIn PDF document text
    • http://tehnoprom.org/assistant_teacher_exam_2018_answer_key1wi6n.pdfIn PDF document text
    • http://slimerecipe.org/jaira_burns_ugly_album_download_torenttkxcfb.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/volewiwanijepefoje.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/J7Vdhhw/19750277483.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/hRpidhb/55463596615.pdfIn PDF document text
    • http://mavito.online/internal_angles_of_a_polygon1chqw.pdfIn PDF document text
    • http://instasale.company/sandwich_maker_recipes_chicken5vsqp.pdfIn PDF document text
    • http://reweder.site/bodyweightfitness_recommended_routinepslgf.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/954a24.pdfIn PDF document text
    • http://easylearning.space/datanufanevadijotwusvw.pdfIn PDF document text
    • http://auth02mobility.com/44502706718kcgmn.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/Fc6jeib/youtube_video_downloader_chrome_extension_2018.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/zakupusepegarad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 4936 bytes
SHA-256: c648ba8294478bf01f6ad42877a698f59740b1ded172b3b947b4a54f8ef267d2
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10424 bytes
SHA-256: 7ab8a9a52b7da250618b55a7239428ed19b3019a5e294ef8ba634d9b07d64fa9

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