Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd2b5ad7de583be…

MALICIOUS

PDF

92.6 KB Created: 2021-03-28 00:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa6b63c5cf148d0173edf5b6d5b0f50 SHA-1: 18e8126327a34391fc02c8a75347321328cda06c SHA-256: 7dd2b5ad7de583be737e895e023add18c61c43ba840389fe4f8ad24a0803a005
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or content-luring scheme. The primary URL, 'https://jumiwimov.ru/wix?keyword=absolute+c%252B%252B+6th+edition+pdf+free', indicates a lure related to a technical book. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/wix?keyword=absolute+c%252B%252B+6th+edition+pdf+free
    • http://boraguw.medianewsonline.com/high_school_english_vocabulary.pdf
    • http://smartline58.ru/luwepidaxojuwo1lggw.pdf
    • http://serarudipiwuvon.mypressonline.com/cosmic_energy_meditation.pdf
    • http://robugipunebib.mygamesonline.org/where_can_i_buy_ti_84_calculator.pdf
    • https://cdn.sqhk.co/boxepupovemu/jghftij/scotsman_ice_machine_repair_near_me.pdf
    • http://sukuwodexi.scienceontheweb.net/fatebufovimaremo.pdf
    • http://rawoxaxevog.mygamesonline.org/how_to_change_the_belt_in_a_shark_navigator.pdf
    • http://kindraretterath.com/way_maker_chords_in_g3iz4p.pdf
    • http://detonic-romania.website/binitolibidabogawog4k1bh.pdf
    • http://pobesegu.scienceontheweb.net/cbse_syllabus_for_class_9_maths.pdf
    • http://repair-monokoles.ru/lg_inverter_direct_drive_washer_dryer_error_codes5m6fl.pdf
    • http://pupezawat.scienceontheweb.net/63073295304.pdf
    • http://bumasujofoj.getenjoyment.net/behavioral_biases_in_investment_decision_making.pdf
    • https://cdn.sqhk.co/kuvapipitol/hcjjqgR/dapabux.pdf
    • https://cdn.sqhk.co/zisenusaf/ehcqjaB/timajara.pdf
    • https://cdn.sqhk.co/zapinebow/hhiegie/61061795603.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://satogitexuvo.myartsonline.com/18004377046.pdf
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_c74e995c56f140b0a13f337c9d68ebf9.pdf?index=true
    • http://kepewitibafef.myartsonline.com/applications_of_calculus.pdf
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_c0e5d709345e43469e77f09845b6a4c1.pdf?index=true
    • http://lawewil.atwebpages.com/81421820385.pdf
    • http://susabumo.atwebpages.com/which_cards_against_humanity_expansion_box_is_the_best.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012af9.bin
4afbc5a4aa408de527ba3d3eb1d67b4ecb89305762eb039482ecd7970b7b771a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 5316 bytes
font_01_sfnt_off00013d03.bin
df315081de9fefc5b51d3fad0ef485f444dcf9a70399dc46f47b83a952cbc962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 11808 bytes

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