Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d3bcecb1947e8f…

MALICIOUS

PDF

75.7 KB Created: 2021-04-14 12:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ee05c589ccb025f3384c9996eda2892b SHA-1: e8087c0969328d8ecb8a7327f4a22b02ff8d25c0 SHA-256: 50d3bcecb1947e8f4e6b83984d0189c4d8d26cb2992e5475d8dd1a72a9ba96b1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple distinct domains, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=how+to+fix+a+throttle+cable PDF link annotation
    • https://cdn.sqhk.co/pafowijexube/sgfhdia/snake_island_florida.pdfIn PDF document text
    • http://tazijiga.22web.org/dsssb_ldc_2015_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/oictaOE/argos_drum_kit_for_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/dSggigG/gold_cash_personal_loan_app.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/gd5Ijg9/23295380842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://powagamojij.onlinewebshop.net/el_par_biomagnetico_isaac_goiz_duran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499d2b6d-c71f-402d-81a2-9453591045fb/what_is_one_touch_ultra_control_solution_used_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f114b1-7e45-402d-8c68-212b244fbaed/juvixalejefebonelop.pdfIn PDF document text
    • http://numifugok.rf.gd/68573981265.pdfIn PDF document text
    • http://renozupopobija.epizy.com/ncaa_basketball_rules_book.pdfIn PDF document text
    • http://paxokebarunune.rf.gd/22121287830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9c4245-dbbd-4ae5-a35c-d76f838c00fd/duroxovibonedovexij.pdfIn PDF document text
    • http://semisoriguregix.epizy.com/corporate_id_card_design_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c99675-1605-409a-9148-ce3966106f2d/99429868591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c43578-744b-4f0f-8796-587004e2efc6/how_to_tie_a_toga_over_both_shoulders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f9e25e-a60c-4245-a503-b3b40ef20314/fijemawokuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1472bb1-31ed-4105-ada8-d407116b5c87/best_year_international_dt466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d6664d-da6b-4d28-8458-6190f34aabc9/61362739477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a746dbb1-4605-4e5a-8bf7-2870b9198097/excel_vba_declare_global_array_variable.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/aldehydes_and_ketones_multiple_choice_questions.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_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 5052 bytes
SHA-256: 6ee743fcdae7f856880da6cddb08fd0123eaa5d77a0b5d8e69511cdbc0f1ea5a
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 10952 bytes
SHA-256: 38957027e00582023f79d97db4e6240d5a03e9c1a1a844e9bf2da75e716dfec4

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