Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1db31861814e20…

MALICIOUS

PDF

85.5 KB Created: 2021-03-15 10:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e8b0e2149ebd69d634810eb0db4414c5 SHA-1: 5d353fbd552c88730f679a9e3aa2026c0d0d239d SHA-256: fb1db31861814e20d2b104b943df306a6a3b8deede76b58f3ea9a3aec0c34595
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://maypoin.ru/123?utm_term=anonymous+text+to+speech PDF link annotation
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/6793220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_602437ef39802.pdfIn PDF document text
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/zamew.pdfIn PDF document text
    • http://dokovuxumev.22web.org/how_to_connect_hp_printer_to_mobile_through_wifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374211/normal_5fce30bf2d5f5.pdfIn PDF document text
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/derubet-jagimuguna-zuvajemug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452626/normal_604e9b3b71085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_600be41d701b4.pdfIn PDF document text
    • https://revowerixes.weebly.com/uploads/1/3/1/6/131607662/lugoparidi_batokaxelabawod_sanunudelo_pojagakegenali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_5fd9ced01863a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jamovame.epizy.com/busy_busy_neha_pandey_video_song.pdfIn PDF document text
    • http://sofapeferusoxud.epizy.com/family_tree_chart_template_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed898f46-e286-4040-ba7d-481247665922/gimivoletil.pdfIn PDF document text
    • http://parutudu.epizy.com/gelinulonasalolig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0ed9ef-7bfe-4aa7-a2ca-5fb286279ff2/pearson_education_2nd_grade_math_book.pdfIn PDF document text
    • http://bisumige.epizy.com/68191697023.pdfIn PDF document text
    • http://vusukunuvedigup.epizy.com/32232596121.pdfIn PDF document text
    • http://dukedofabi.epizy.com/wijilajipedil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0cdec0-a8d2-48bf-a3b5-85afb85cd9ab/ground_zero_suzanne_berne.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_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 4992 bytes
SHA-256: bea81d552729d3189166df61c5e65aca931d667aefbf9f6513afd20231a79708
font_01_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 11920 bytes
SHA-256: a3735cda20276ea322742c4f22d7cc7ca4103c820ab65d67057f75c83d149251

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