Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cd98b6c6b7dd83…

MALICIOUS

PDF

74.8 KB Created: 2021-03-13 14:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b468939fda7519d61762a83bb49b5bed SHA-1: df6c6f8803eb42a01c067ca0373e94ff69f933e0 SHA-256: 57cd98b6c6b7dd831ffeb20a203f9b67e87261de8a77da95122d74445549e37f
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 0.9999

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://baarspo.ru/strik?utm_term=one+group+pretest+posttest+design+quasi-experimental PDF link annotation
    • https://cdn.sqhk.co/kekazorub/Zrrnkrj/bosanuj.pdfIn PDF document text
    • http://servisvds.ru/foxufobeximugtlzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_602af7683fdd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5ff794753e38a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_601745e7b906d.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/hallelujah_christmas_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/e2vhd6V/real_drift_car_racing_mod_apk_aptoide.pdfIn PDF document text
    • http://dikagowoxi.sportsontheweb.net/fimuponinegezidizaro.pdfIn PDF document text
    • https://tuwakunasuj.weebly.com/uploads/1/3/0/8/130874309/zuxore.pdfIn PDF document text
    • http://netewe9.xyz/murray_push_mower_walmart3g52l.pdfIn PDF document text
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/8923516.pdfIn PDF document text
    • http://mattelipsticks.site/minister_license_requirements_in_arkansask2w3b.pdfIn PDF document text
    • http://ttop-shop.com/bolivia_6_argentina_1_formacionesq216d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_60442ff2be10f.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/3621882.pdfIn PDF document text
    • http://hookup757.fun/popogogeretiqixf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_36922e1e271f4b0a87e0dbb1060cf443.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_abb81f2c0b4c47a483667cf63e25911c.pdf?index=trueIn 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_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 5532 bytes
SHA-256: e75752344eac41370dee8d304ff8d68ca3055139f523d98f2cc455963cc80d47
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 10796 bytes
SHA-256: 84c4e76644980a995aeb272cbf2d964bad82a0610a35bd4dacd13beb7b0ff0e0

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