Malicious PDF — malware analysis report

Static analysis result for SHA-256 3273b0d8f6d6f57e…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 22:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d54893c396a43f74509b7d33c6c5950 SHA-1: 9cb90a20def1e5f92baeec97f8f1a1ed780084ed SHA-256: 3273b0d8f6d6f57e6a696dc4dffb696f74b02f4813e0d9761db6ca78824322ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://seumenha.ru/strik?utm_term=apft+standards+by+age PDF link annotation
    • http://reduslim-buy.site/ar_verbs_in_spanish_conjugation_examplesu8q0p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_600c9931df4bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fcb2dd47ef3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_601f0b86bef67.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/hhijOFa/27834155294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366978/normal_5fff5c61b0bab.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/aaghxVQ/gonewesabebimafub.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/LhhfHKe/sizurojawunarapapetewo.pdfIn PDF document text
    • http://wbigs.space/twins_effect_2_full_movie_freeeuk1z.pdfIn PDF document text
    • http://goloszauniver.fun/broadcom_ush_driver_for_dell_latitude_e6520_windows_10an9ph.pdfIn PDF document text
    • https://cdn.sqhk.co/gonaxetuped/Q1FOjjf/breakup_diary_new_video_song.pdfIn PDF document text
    • http://momsmall.space/hidden_figures_worksheetkvv23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/does_a_maytag_centennial_washer_have_a_reset_button.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_0fdadeff2821488a877a68d93afef47d.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_c0950b5630dd40568a3f58524b224751.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_9d9fd93842ea49ee940c79c780dfb595.pdf?index=trueIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_06afa0cf9a274fad84e91113c106711f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/whats_the_difference_between_vitamix_5200_and_5300.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_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 5408 bytes
SHA-256: 3fdef941a158831757757195f26fc1d3aca99a41372ceed8f09274cf3349be39
font_01_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 10960 bytes
SHA-256: 030e65442f739380e61faefe6f4fc52d17120ea1ee9d70280d06842bb6d210ef

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