Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59c8cec9543f286…

MALICIOUS

PDF

74.1 KB Created: 2021-03-09 14:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b26d0f48cba92c9881870e34ade7765 SHA-1: 173ce4ba1c8a26f43451addb9a0f55d1b260ccce SHA-256: a59c8cec9543f2861c71f5593831b2dfc4c7005e108a0fa3151b3b4e8862ccbb
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://resalured.ru/wix?keyword=batavia+bulldogs+football+score PDF link annotation
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/3598735.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/xMHjbgc/get_followers_and_likes_apk_download.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/9491300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_60045c2fc1224.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/rBha3qt/rustic_wood_cutting_board_with_handle.pdfIn PDF document text
    • http://xekilekugud.iblogger.org/muvupogafosirir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5fd8539bb5d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd2e6f8521b8.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/b48ae562e5968a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozobavotij.epizy.com/tipurusev.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_229557a3275e46ceb6394651c9ddfb17.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_4f2c5c33b61c42b59b5522c2e511aa88.pdf?index=trueIn PDF document text
    • http://dinazodes.rf.gd/nezusapo.pdfIn PDF document text
    • http://dapunujunet.epizy.com/borumuvunezilupugijuwa.pdfIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_9b11e21c6bfa44fcbca3c3e4a5628101.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4139344d-cbb1-4171-add8-d8c583766e95/what_is_your_philosophy_in_life_tagalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b2238b-3f90-494b-a158-5ff31f570245/sosopajosavoribi.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_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 5440 bytes
SHA-256: 8d87fa955dc019155a0e04863033c4b9eca0eee9ca8c5ab1b686acc34fe9e59d
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 10476 bytes
SHA-256: 5057f77a02613698841e07cc008b705b95a142d579ad206909b7516edf46b68c

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