Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c67c56428581c11…

MALICIOUS

PDF

79.6 KB Created: 2021-04-06 03:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8dfe8a874e42f0173b07541e692c11ef SHA-1: f248a33a180ef5be723e62945b4cf8c2b9cfc820 SHA-256: 4c67c56428581c11c00589c42aa061df18d12c40fe7ccad46c48e2165947d7a3
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://zajinet.ru/aws?utm_term=spaghetti+in+a+hot+dog+bun+summary PDF link annotation
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/sagisino.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/fhbzNih/nora_fatehi_new_song_dance.pdfIn PDF document text
    • https://sikapekit.weebly.com/uploads/1/3/5/3/135317012/2082299.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/A1ifDtj/robotics_software_engineer_education.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/dbDfxjh/samozogewufowaguk.pdfIn PDF document text
    • https://cdn.sqhk.co/nokowifupe/jbhgLjc/73204207375.pdfIn PDF document text
    • https://cdn.sqhk.co/zipedufipiz/hdzvihj/97410059675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_c570ccb127154368ac370cbe2940f5bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c5d2e3-c5b6-4bc7-8ac3-ea0b8aa0096c/zizazuredeferir.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/41248976782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48297116-370a-4f07-bd6d-e05c9475fa54/conversion_6_pulgadas_a_milmetros.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b2a174a0d9434f0ab5aed2c661bb17fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e15b24-ae3d-43b3-83d4-ef5701ffafec/60065019383.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_b98b4d1811ad4769996086b6e5b73ec2.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_9a26c07442eb43d9bea94486990dc2ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a995dbc-781a-41c1-b24c-f1f2bb51bb22/how_to_check_a_golf_cart_controller.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_a1fb87c4ca6a44879034d0c19d0aa633.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_c76d04ad4adf43b5aaa1d94421ed48cf.pdf?index=trueIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_08aededf50714e4bb139646bb711f47b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/sonobaxivazafol.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_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 5688 bytes
SHA-256: 78a9021356074aaf6b93a276fbae77e3fa8b323e63160e8df12787a3c9709601
font_01_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 11160 bytes
SHA-256: 0b50a23f24af6c051e9e49b8ae04396f067256f4e880f8b8e38b3d7871bc446e

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