Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c97fb1ab9d3d93…

MALICIOUS

PDF

79.0 KB Created: 2021-04-18 23:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f702a8fed7ba2ed378feae7ad081fd53 SHA-1: 91a9ed92b442dbde506054626d877cef896eaedc SHA-256: 49c97fb1ab9d3d93e003b5f04393c4edf3fd5bb78307075604e7e2d173cdfc8c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically appearing as a search result for a textbook, likely a lure to direct users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution campaign. ClamAV and ML classifiers strongly indicate maliciousness, consistent with a phishing or trojan delivery attempt.

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://jacksth.ru/strik?utm_term=textbook+of+pathology+harsh+mohan+8th+edition+pdf PDF link annotation
    • https://jigudisite.weebly.com/uploads/1/3/4/6/134603970/degivob_bejoxemuf_sakim.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/why_do_i_get_a_warm_fuzzy_feeling.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/vezisekovarikobiri.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/19539934905.pdfIn PDF document text
    • https://legutuxubumid.weebly.com/uploads/1/3/1/8/131872058/24c8af177b9991.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/d-link_dir-615_modo_bridge.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/9824bfde.pdfIn PDF document text
    • http://zajilakofudo.scienceontheweb.net/bacteriological_quality_of_drinking_water.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://fafusew.rf.gd/all_shook_up_can_t_help_falling_in_love.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_9c87e84e2512458e8c90ab897ec074d0.pdf?index=trueIn PDF document text
    • http://gipezivav.epizy.com/how_to_take_apart_a_ingenuity_bouncer.pdfIn PDF document text
    • http://jategemi.epizy.com/english_literature_classes_online_free.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_d05a4ac467f64174aefb7310eee9f6ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedudo/pdf_topology_1.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/linux_shell_script_variable_in_string.pdfIn PDF document text
    • http://matasup.rf.gd/marathon_watch_manual.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/tefofupu.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/constitucion_de_venezuela_1830.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/can_you_take_your_ged_test_online_in_texas.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5760 bytes
SHA-256: 8a1d441f0a2f8fbe9f862cbb4df7c2b48193b257b664f1798a29e5e028d163cf
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 11236 bytes
SHA-256: d8c108b3a949eea2446c37d24960b2af47c1a92b08e692c705f5075204d6576c
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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