Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c61a6849806bd5…

MALICIOUS

PDF

68.1 KB Created: 2021-01-24 01:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e057eb6168226953fedd18a0989ddf53 SHA-1: 93ab83961a9c124cbea1322887c4ee7437c8ba69 SHA-256: 89c61a6849806bd5bcbc0a5259ac6553d43119bf18e3b0b80b49b3fb9349dd85
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/123?utm_term=iphone+sd+card+reader+how+to+use In PDF document text
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/lefaseda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408001/normal_5fec7616c5c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5fd12451c7049.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/jhcyPNz/what_episode_did_howard_wolowitz_mom_die.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/gfOjbgg/kevevikitowekijunix.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/jirawu.pdfIn PDF document text
    • https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/wuzejuz.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/9ZDibjb/hatteker_beard_trimmer_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5fc90b889506f.pdfIn PDF document text
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/9413548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454813/normal_5fe353d70ba37.pdfIn PDF document text
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/liganuxebol-xivejatipol-zaduvuxepomopip-vofabukajo.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/gozilum/dark_souls_3_epilogue_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/kamus_bahasa_arab_indonesia_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/dapotabeneba.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/keygen_coreldraw_x7_bagas31.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_off0000ce46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE46 5160 bytes
SHA-256: c75da59ea8e1f7dcf13a9d3bc1f7a9a40c5c15b0097d9c310f168aff71c6ec05
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 10484 bytes
SHA-256: 39767be0de30ef404264807d84383e0c6cef24bf4ba773c5050158dbc699e949

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