Malicious PDF — malware analysis report

Static analysis result for SHA-256 407fb9d59fca0e02…

MALICIOUS

PDF

79.1 KB Created: 2021-03-03 02:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 878e251f7b41ee76af5e483fe203ec93 SHA-1: 9f5cf8b0b921aa4eb93a6961f9ba3553f794eb23 SHA-256: 407fb9d59fca0e0260340aea91f830478c6c16b76d609761024cf4188ddc79c7
126 Risk Score

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 0.9998

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://seumenha.ru/wix?keyword=download+cyberflix+apk+on+firestick PDF link annotation
    • https://memonimip.weebly.com/uploads/1/3/5/3/135349780/4464176.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/higImgd/school_management_system_web_application_in_java.pdfIn PDF document text
    • https://dasiwijumajofep.weebly.com/uploads/1/3/0/7/130739595/zefivosafedarizo.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/3167586.pdfIn PDF document text
    • http://testrun.ru/my_little_pony_tails_of_equestria_pta0bj.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/vibjiYu/live_stream_nfl_football_game_tonight.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/moxiso.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/hiiighh/senior_mechanical_engineer_salary_california.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/childrens_short_stories_about_gratitude.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/vintage_dressmaker_sewing_machine_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/PztieZl/muwepikuradogevukevuji.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
    • http://dowafirowelumex.atwebpages.com/hp-pavilion_dv7-3000_service_manual.pdfIn PDF document text
    • http://laxukumelukadut.myartsonline.com/rogezefegegubavugi.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/68721200238.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/what_is_facebook_unique_id.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/dogoborokukapogipupizi.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 5400 bytes
SHA-256: 34b957a32d2a88c89b62499a0592d2fb6e09ce9662aa253f37d050271dd238ef
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 10608 bytes
SHA-256: 91a74b932754e7ff40f9c6c935e66dc4b1adaf4115212c6d92aecaacf450233f
font_02_sfnt_off000120a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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