Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54f045529728b34…

MALICIOUS

PDF

74.8 KB Created: 2021-03-03 21:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7b5e262c02cb73fed785f07a4f1f143d SHA-1: 05382617662d73130798c9bac95898721040d7c9 SHA-256: d54f045529728b34bb5844fd3e3d5ea52d28841f65c85e5c4941762e504a523e
126 Risk Score

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 0.9998

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://jottigo.ru/123?utm_term=how+to+write+a+pitch+for+a+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485016/normal_60145cb752f64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494436/normal_5febd6a595583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_603a0b35b813e.pdfIn PDF document text
    • http://artdebug.site/the_heroines_journey_workbookhvzl0.pdfIn PDF document text
    • http://javebamugizal.66ghz.com/bed_sheets_on_tv.pdfIn PDF document text
    • http://instofficial.online/satisfya_imran_khan_mp3_download_320kbpsiapjz.pdfIn PDF document text
    • https://jipunexekamu.weebly.com/uploads/1/3/4/5/134588935/0cc3a79.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/allan_mckay_fireball_free_downloadks9ru.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/68225791719cvfsl.pdfIn PDF document text
    • https://cdn.sqhk.co/mixukavusu/Qgcjgje/vivivuzozoxom.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/tukepegibuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/C1iimhb/tuvetatojivinapawo.pdfIn PDF document text
    • http://site-shop.xyz/pokemon_3ds_rom_hacklxgjr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_601bc559b4d67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/70710702911.pdfIn PDF document text
    • http://relotetuje.rf.gd/byju_learning_app_apk.pdfIn PDF document text
    • http://moxozejoxolisuf.epizy.com/zujiperos.pdfIn PDF document text
    • http://jetetejev.rf.gd/dozoxebebizejejoditivi.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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 5148 bytes
SHA-256: 3af8ca49b8756dc898297bcc6e61f0e93c11e2ea0ca44fe8c3836c51ec1ec5c9
font_01_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10116 bytes
SHA-256: b933ff73d6d2d6c452eab5ab726aba6aa956e4f0fa02b9d9e6802ddf11e9887f