Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48997f7b19f9819…

MALICIOUS

PDF

77.7 KB Created: 2021-03-29 05:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7751e323693a41abc264f94d64978ff9 SHA-1: b18515a7aae31318120f956f0804a7ae4d45a697 SHA-256: c48997f7b19f9819e3a8abef4659f57da836b8a2dd6fc6166591ea2494926dee
156 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. 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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=amazing+grace+piano+sheets+pdf PDF link annotation
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/zolabudanugu-valudinibuxik-mafukuzepubi.pdfIn PDF document text
    • http://kinokaiff.space/dibitusle6g.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/nonamubid.pdfIn PDF document text
    • http://lishop.site/xodawapetosavijubalenugjm01g.pdfIn PDF document text
    • https://xujuzulixup.weebly.com/uploads/1/3/3/9/133999631/5510693.pdfIn PDF document text
    • http://storeyou.store/steel_ball_run_race_real_life0e1iq.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://s3.amazonaws.com/vuxagixil/likofoxurepefejuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/adj_ultra_hex_bar_6_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e04a70b-d397-40ba-9232-09ce3f1885d5/66652123512.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/kapugezusaresarifuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa1d40a-6917-4fe5-ada3-669e43048ada/lijapalusonuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6659e1e6-dd8f-43d6-96b0-37f507db19ba/craftsman_drill_press_chuck_key_size.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/control_systems_engineering_nise_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76acfae7-9c87-4dc2-89de-b051a1c8f21e/siguzijevuwiginomagadum.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/judonotazojovigelefudobi.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/27498180552.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/kindergarten_coloring_sheets_fall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699b698d-3fc7-4264-a535-89ab20690c27/sony_hdr_cx240_memory_card.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/bestandsaufnahme_gebude_protokoll.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/introduction_to_bioorganic_chemistry_and_chemical_biology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 5364 bytes
SHA-256: 7e51fda71c2d734718ad889090035e973f6c45ef3a2338cdecf2ae0cf1789992
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 11876 bytes
SHA-256: b9c3306ec9288875a9e7ddcf0283281860a079e930dcb80b8dea541b885470f5
font_02_sfnt_off00011b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B50 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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