Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a9ecc078da31bc…

MALICIOUS

PDF

80.3 KB Created: 2021-05-31 22:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 759814b35e42901fb3ab35a5ce28260c SHA-1: fdafa79288de9f1650220f12db11689ea34758bc SHA-256: a3a9ecc078da31bc98ce04332c1362fbc1bcafbd9e28a112c0dad8b31fe637d3
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://bologen.ru/123?utm_term=child+and+antenatal+nutrition+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385217/normal_6003f287cab1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_6030e4cd235c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60647b9ab28e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_606561e0dba75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_600b8c5b1b576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_604792cd2b7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421788/normal_601e3ae862762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://famukaser.pbworks.com/w/file/fetch/144423588/nemaruginekebo.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/f/bebodojares.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422454/zarobirijebogojepomejedid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700dac35-6c58-4622-ac7f-93ec016b1269/how_to_make_a_poetry_slam.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144411978/mugurabilasasiw.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/what_color_are_baby_bella_mushrooms.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/3gp_mobile_movie_hindi_2018_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4837cf-f311-4899-9b31-daf3cd630fee/daredurakebufalip.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144412599/discografia_fito_y_fitipaldis_descargar.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144424110/how_to_stop_indesit_dryer_mid_cycle.pdfIn PDF document text
    • http://mejigulo.pbworks.com/f/40603884010.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/42016832839.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144416385/39976624719.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_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 4792 bytes
SHA-256: 7751dc9061c7fde3b21dbffba269f86cc94434765b8d9e93eece78820dee39a0
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 11116 bytes
SHA-256: a6431af1cd8e660431f26d41e295789e2e337972792750023c1e27aadc797401

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