Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db6dd34861f1607…

MALICIOUS

PDF

88.6 KB Created: 2021-03-04 07:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 644f98e785f42747a8a50b7168ce3f5b SHA-1: a2245ea0f17a4617e7a55ee9140d0397a69d5b2a SHA-256: 5db6dd34861f1607ddf4c5185f440cb082335f858d2f14cdea88d7970f4df0b4
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 0.9990

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://zajinet.ru/award?keyword=what+data+collection+tools+are+used+in+qualitative+research PDF link annotation
    • http://lajipuv.iblogger.org/how_to_file_a_lost_phone_claim_with_verizon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476123/normal_5fca400c1fc5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_600e324dde9b2.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/aagiGji/91177373135.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/31283160428.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/ion_profile_usb_turntable_software.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/manual_del_conductor_de_pensilvania.pdfIn PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/wuxabam.pdfIn PDF document text
    • https://mivagefe.weebly.com/uploads/1/3/1/4/131453450/2932676.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/6743996.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/R5jjjhe/radio_fm_y_am_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/jajgmgu/naat_ringtone_mp3_song_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruvowepager.epizy.com/bach_invention_3_sheet_music.pdfIn PDF document text
    • http://bejofidexi.epizy.com/faduti.pdfIn PDF document text
    • http://zopegekole.rf.gd/expandable_cordless_phone_system_without_answering_machine.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/repair_sloan_flushmate.pdfIn PDF document text
    • http://luvurukakun.epizy.com/kafuvom.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 5224 bytes
SHA-256: e869d35c7305d21afeef2efb0860c60c8bab5820bad98268d3c4ac550a8cbcaa
font_01_sfnt_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 10548 bytes
SHA-256: 2498d6b14ff2698fad1d3538e006528a9a97fb0b7e057b9c6d22d43bd28c1413