Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3731e1133ac4033…

MALICIOUS

PDF

81.0 KB Created: 2021-04-21 03:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a15c76a08007426646725b7e2fdada21 SHA-1: 53e3eedcf9e7ed5b05eeacc965303a143fcb6df7 SHA-256: e3731e1133ac40338057e7b92878520ad537085d383727b44eb15558ac58332c
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-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://jottigo.ru/strik?utm_term=what+happens+during+orientation PDF link annotation
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/gemowutukizuju-wegejawawepanes.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/iiJrdgj/17777464252.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407057/normal_5ffa4168e941f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5ff486a9bd1c2.pdfIn PDF document text
    • https://cdn.sqhk.co/paleguvebo/icOjjhh/jaralajibudanawurod.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/jcmhfhc/charlie_s_angels_the_game.pdfIn PDF document text
    • https://bizonununifewe.weebly.com/uploads/1/3/4/7/134773553/d0569cfa99aa6d.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/ujqhhSf/starcraft_rv_parts_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489404/normal_5feefda9428cd.pdfIn PDF document text
    • https://cdn.sqhk.co/ninuxoti/eicIibl/loxabureferewusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_a7d2129c11114c58a675b461e6ce39e1.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_e94978d46eb5407f9ea12af1b8d7cf37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/92602370029.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/product_backlog_grooming_template.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/kozeko.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_10efd78fe99f4320b306adc8cfe06f0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/doboradezefawo.pdfIn PDF document text
    • https://2cc935b2-b854-4d3d-8499-e3bac5ec7384.filesusr.com/ugd/2e82fc_1d9c002464384c57ab2af9656f9df11d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/20989486509.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/country_guitar_backing_tracks_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 5200 bytes
SHA-256: 3fdff6669bffdba50ef7e368acd5b4beef81e3f16e0b8bb5d888a0f24e0f4b33
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 11472 bytes
SHA-256: 70f033352b01851acd5e536281b7667eead3d26225d2f58775f08b6df2235f7a

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