Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ee5cf799fb52ef…

MALICIOUS

PDF

82.5 KB Created: 2021-03-25 04:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d11db50f9e56d3f4e008f92f8997a00 SHA-1: 7549419b4f3c08d6612b95323b9c17ae73e89cac SHA-256: a9ee5cf799fb52ef535e1c64268dbc88daf3a7fe14ccc548a89668bd25017f5d
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://yafferge.ru/wix?keyword=hotmail+iniciar+sesion In PDF document text
    • http://motivawka.online/80395716972px5po.pdfIn PDF document text
    • http://indonesia2health.online/964125982241ghui.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_60041e51d1356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_603cc1eba6104.pdfIn PDF document text
    • http://lbaranaydin.com/midland_walkie_talkie_gxt1000gkl8t9.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/Sjihjig/27694032708.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/how_to_make_bluetooth_not_connect_automaticallywiryt.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/jbjhhb5/my_lips_hurt_real_bad_quote.pdfIn PDF document text
    • http://good-production9.site/how_much_does_it_cost_to_spiral_bind_a_bookb74gb.pdfIn PDF document text
    • http://amst-watch-v1.club/22382606064yn6iw.pdfIn PDF document text
    • http://latencfsrt.space/pugipigirupoganoa8510.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/jGPha7d/black_hole_apocalypse_worksheet_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_60145f4ca8204.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/eihbgin/best_of_the_90s_r_b_music.pdfIn PDF document text
    • http://cloudmarket.website/xugetimurasetezonaszt4g.pdfIn PDF document text
    • http://technodom11.com/5441484274898yqq.pdfIn PDF document text
    • http://afracheat4.xyz/7633167593bnpvt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5fd3b5bc32281.pdfIn PDF document text
    • http://hs-life.ru/the_sum_of_the_interior_angles_of_a_regular_polygon_is_3060._find_the_exterior_anglebe5re.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_4f220767a35749a1a3755175da0c9fdb.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_5e01e80d7a6843fab8dbe001338c5101.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_74485d73b2e643bb82f91e9f2c96c279.pdf?index=trueIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_521a9370eaa2495daffc5f432dc5785f.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d564d25bf5e34624981c6c0efe825191.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 4696 bytes
SHA-256: 5e74127ec7264396c72ab24e90738749f2bb11e1b9fe9e9e508bda4c25a83572
font_01_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 12276 bytes
SHA-256: 785cde399fdce2a90d41f2d8eabf30ca500b92a67e779009f13aae0b1b925c88
font_02_sfnt_off00012e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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