Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe5c4e3ffbc5841…

MALICIOUS

PDF

69.4 KB Created: 2021-03-28 09:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7541a85a6cf7fdac13b8fbdde4a50fb2 SHA-1: baf016f31b42200dd6dc16d77324458bfc4eb329 SHA-256: 8fe5c4e3ffbc584138d6d56161ed26961a3ff99489f6cd1ff7b9b094b664622d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains or link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL that appears to be a lure for 'jnc 7 guidelines for hypertension pdf', reinforcing the phishing pretext.

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://ponafet.ru/123?utm_term=jnc+7+guidelines+for+hypertension+pdf PDF link annotation
    • https://cdn.sqhk.co/gusiloxi/9Sjchco/jokakaxume.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdfIn PDF document text
    • http://nepesesi.22web.org/92242558202.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/3hgxiJ5/73345464486.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaluwozez/hjccidW/android_pie_samsung_note_9.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/ic8jegi/ninja_turtle_lego_minifigures.pdfIn PDF document text
    • http://zinifezabi.iblogger.org/88109371805.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/j11gfij/kokewuzasebaxijititap.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/cljcjf7/red_toddler_uggs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_10ad767ade1049f2bbbca65a85593ebe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70d2182-fd79-478b-82f8-fa565825ff31/75464726626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6a870e-844a-4311-9b68-5d8df63fbfd8/dewalt_d55146_type_5_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fcee7e-f6dc-41b6-86a9-deb74412bd22/59187211528.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_ffbbea9159b648bbaccb1d6ccd7d4273.pdf?index=trueIn PDF document text
    • http://xorikija.epizy.com/kukeruzijamijip.pdfIn PDF document text
    • http://fibifogusezax.rf.gd/38903296215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053f66a9-18fe-4792-bf98-1e98be550300/jr_showtime_rotisserie_cooking_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df871df6-c845-43f8-bf96-f36218f2ded1/what_is_the_tone_of_a_song.pdfIn PDF document text
    • http://molodetagako.epizy.com/ankusam_songs_naa.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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 5376 bytes
SHA-256: 5407d259cf3e4cb2d5e1141211b8187f97b48d111db1747016d00519338b758e
font_01_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 10508 bytes
SHA-256: 7380ce387ac3e6a023bb41d84e30a73da0e7dc9b3e64000df9a8c3ccb6fe23eb

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