Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dc580ddc1e1054…

MALICIOUS

PDF

84.4 KB Created: 2021-04-05 08:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a471404d0a534f419b23a548f1028212 SHA-1: 158887a44885bbdcab8579cece47e7437a260680 SHA-256: b8dc580ddc1e1054191aaf1d9104a03925ae0e9eae36083ad5ac5f2c694d7555
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 0.9996

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 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://zajinet.ru/wix?keyword=dyson+air+purifier+troubleshooting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459319/normal_6020018473413.pdfIn PDF document text
    • https://pudafeborebe.weebly.com/uploads/1/3/4/3/134335494/muxojomofitedufut.pdfIn PDF document text
    • https://sifasoralut.weebly.com/uploads/1/3/4/4/134488674/guwiwo.pdfIn PDF document text
    • https://bipusisep.weebly.com/uploads/1/3/0/7/130775903/nofodutijozojuduze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412891/normal_5ff85f7837bd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426688/normal_5ff356ee7700d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_6037792ec7a24.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/nonabafat/how_to_bleed_a_kerosene_monitor_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/the_world_is_too_much_with_us_romanticism_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/android_chrome_reorder_bookmarks.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/sufefazuwegekazezosim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb52593-5d4e-4307-9f45-f9e24a6f3dc7/dd_5e_monster_manual_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/jiganumerifedirulunosi.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/62863818050.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/vuliguxugofumidisakovenev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db08089e-b351-47c2-bf97-dc87933a7328/reloj_citizen_wr_10_bar_gn-4w-s.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/xolarevanopefawulujaroful.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 5284 bytes
SHA-256: 8ef3455b7797ddbf73b492db89376cbc0d5953faaee8bfe6a30cbaf045f7db09
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 11276 bytes
SHA-256: beacbf6f41160f8418cf94788de65dd6cd8c557683da7ce64a6bbc174708a60f
font_02_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_03_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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