Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c41f2a1ef29509…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 16:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 59b97fbc4b4432742bdbd51072d563e5 SHA-1: 10684f952be77bf5c75b2300b35a17ba73853831 SHA-256: f5c41f2a1ef29509bba6b5fbdced2703b134e5223f06b7b3334b8094519aaa78
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 0.9996

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/123?utm_term=kaufland+gazetka+od+jutra+pdf PDF link annotation
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/4231148.pdfIn PDF document text
    • http://vulomufukuvi.22web.org/xirenututoborofasazeko.pdfIn PDF document text
    • https://nozigofomin.weebly.com/uploads/1/3/4/4/134481739/vazepuzet_fesenulofinuja_zenabakogori.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/20246734754.pdfIn PDF document text
    • https://kudoxere.weebly.com/uploads/1/3/4/5/134591480/8232748.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/42678301700.pdfIn PDF document text
    • http://ranomurivokav.22web.org/jupatuzadadabivuten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_2a89f2876c8e4e6d8c4706066b834d97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e28773-2865-4632-9fbe-26ef24f2f730/71168569588.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/xivibiruvapupogane.pdfIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_ec3e5abd7ac7443187aa1f5682f1c0e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/scotts_speedy_green_1000_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/campanella_sheet_music.pdfIn PDF document text
    • http://tikikenuf.epizy.com/parovura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99aed5ba-71a2-4699-85bd-aa3f48fc4a4e/nezizabadisexinapifavos.pdfIn PDF document text
    • http://bupomejov.epizy.com/cet_2019_result.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e2c918-d78a-4f3f-ac21-fce165a68dc7/17_day_diet_reviews_pros_and_cons.pdfIn PDF document text
    • http://diruben.rf.gd/4248087249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebeb0736-adbb-48a5-9e35-45b76a6b62e4/how_much_is_internet_service_with_dish_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f832ff7-88cb-4d51-ae33-78a4688c2148/12881409545.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/56025205702.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/lavurisi.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 5192 bytes
SHA-256: fa753bafaf35f2c25f7dad87c7873f57c268eb5f054c7cfc50ee0f4819ce8c64
font_01_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 12416 bytes
SHA-256: c936eadb11b6516df4b6fe80071765de02f0ab17d42ba9e7bfdaba431f1927d9

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