Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1e0224d671126d…

MALICIOUS

PDF

133.7 KB Created: 2021-04-08 09:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 44ab23b3d2c6b63a4cb99c9ee1bd16fb SHA-1: 823b1d0151b33e6f30b71899c09a93461a6d73a6 SHA-256: af1e0224d671126ddcd2c0d43b72143920e2529b827fde19f80b30064f97d2bf
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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://ponafet.ru/wix?keyword=%25D9%2587%25D9%2585%25D8%25B3%25D8%25B1%25DB%258C%25D8%25A7%25D8%25A8%25DB%258C+%25D8%25AA%25D9%2588%25D8%25B1%25D8%25A7%25D9%2586+%25DB%25B8%25DB%25B1 PDF link annotation
    • http://1eyvgo.xyz/autocad_2d_and_3d_commands_with_exampleswnp2i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_602cdc0258a44.pdfIn PDF document text
    • http://therarbooks.com/demy_like_for_instagram_apk_new_versionevezl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fd67d8222c9c.pdfIn PDF document text
    • https://povaginomoti.weebly.com/uploads/1/3/2/7/132740536/614407.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/f79226670b7.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/faxejopubirukofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5fcf30bff0362.pdfIn PDF document text
    • http://vykupavto54.ru/wefiluvibpz2.pdfIn PDF document text
    • http://imm-shoes2.club/julupufogogobajajinenaqa4ho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_602025c63ef7e.pdfIn PDF document text
    • http://lollipopa.online/63684611778dmygz.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/gadimakosuf_lasifunaruz_mapesap.pdfIn PDF document text
    • https://bapidovomefizeb.weebly.com/uploads/1/3/4/3/134382768/9920279.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/MheuIge/bunazuwopa.pdfIn PDF document text
    • http://kurs1.xyz/xesaxopuwijisozunckwrk.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/hVLgQhf/novodomigirod.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/gihfsMt/38276835308.pdfIn PDF document text
    • http://tranquils.space/which_cartridge_for_hp_deskjet_1510t4xqu.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/UhfHNY4/adobe_photoshop_cs2_brush_free.pdfIn PDF document text
    • http://musc-media.xyz/mississippi_state_university_google_maps22rl7.pdfIn PDF document text
    • https://cdn.sqhk.co/pajelidul/b0pGHl3/56478356424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001d07d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D07D 30808 bytes
SHA-256: 65812876319b5ff0d9559cc1e7357654144fedeb6a8aa3f3efc8f5ddb9ebd6ed
font_00_sfnt_off00018616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18616 4068 bytes
SHA-256: 60a2d6429503f7a4ddaf98851b2b9757a5da54dd45bab0a2aed837b7042708be
font_01_sfnt_off000193f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193F5 9760 bytes
SHA-256: 661c6be3a99f5591950d242f0a408785cdd048feb3bc6e57056b3fd8ff7ae82d
font_02_sfnt_off0001b581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B581 17700 bytes
SHA-256: 77480d7ce4a97476e02f2ae25aa9bef6cfe4594e81f413909e9182ada64c43fa