Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4155b6e76e7ecee…

MALICIOUS

PDF

73.0 KB Created: 2021-03-18 03:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 566ef6f2332913d8f395bdbad32dd709 SHA-1: 287216f0afaaeaa8e6f20f7c5356bb345670dc6d SHA-256: b4155b6e76e7eceea68fadbd08acd8acc931cff77e9796777ebd8a6c632460ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and the presence of many external URIs indicate a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=the+muscular+system+sliding+filament+theory+worksheet+answers
    • https://cdn.sqhk.co/zejejofe/hxEjmQA/nintendo_ds_games_cheat_codes.pdf
    • https://cdn.sqhk.co/fogunivugame/gib6Kyz/36987014437.pdf
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/5075825.pdf
    • https://xegugunozom.weebly.com/uploads/1/3/1/4/131482992/pufelaverafupineda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tubukeganuji/bosch_serie_4_washing_machine_manual_india.pdf
    • https://s3.amazonaws.com/dexodekelaseki/85367616387.pdf
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_10a7400f0e324bd28d02abf306b1474c.pdf?index=true
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_c8b9eb4a3a8a47cdbec66bbb04b541e1.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_c59e9de92be2447795cae160f65cdb92.pdf?index=true
    • https://s3.amazonaws.com/muxozuvalubi/27682377584.pdf
    • https://uploads.strikinglycdn.com/files/1a31ab79-6041-43e7-b0e5-962a14daef60/walijixofaje.pdf
    • https://uploads.strikinglycdn.com/files/76e58ffe-2ecf-4b03-a43c-18c056d7ee59/un_grito_desesperado_pintor.pdf
    • https://uploads.strikinglycdn.com/files/20314a85-3aa9-488c-96e6-81b01ed0e35c/18292350340.pdf
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_0ca97675630440bca0ce629ea4222d79.pdf?index=true
    • https://s3.amazonaws.com/pasutiz/billie_eilish_photos.pdf
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_7036c42bc4f44e5392bbf42b904414d2.pdf?index=true
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_d0905d40d84947fa969bc619378eb8c5.pdf?index=true
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_66a1a41ad2c940d1be6c3ed0612f7553.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defd.bin
4383f0f0bd7d7101213847f6be7bcaedf09b2e8987eccf421ee983f9ebcf8973		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 5640 bytes
font_01_sfnt_off0000f21c.bin
bdd576751c98cbd8b69adaf2c8d455d3deb1bbc6645d5f69a67d8bfde6ec9a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10784 bytes

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