Malicious PDF — malware analysis report

Static analysis result for SHA-256 5544e2e69a4e84b2…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 15:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6ccc139039c39fcf0474ff0a894d3c91 SHA-1: 9481efe29006a8c4f53b4eac93a5508cdae1c4dc SHA-256: 5544e2e69a4e84b20c0e8f3723996cd1eee050725ee32d4e003483dabd05bb0b
186 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 0.9998

Heuristics 6

  • 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 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.
  • 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://dafemum.ru/123?utm_term=africa+house+music+free PDF link annotation
    • https://vejilete.weebly.com/uploads/1/3/5/3/135312445/sadinel-bigokoxot.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/fcf8f808beb2b38.pdfIn PDF document text
    • http://drnextact.xyz/hitachi_12_compound_miter_saw_c12fdh7m19o.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/c94eee8.pdfIn PDF document text
    • http://soinjaga.ru/glencoe_geometry_chapter_1_quiz_2_answersychnw.pdfIn PDF document text
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/1717710.pdfIn PDF document text
    • https://zufojemesegogof.weebly.com/uploads/1/3/4/7/134753559/wonamalafavin-kasokaxoro.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/QppjfUY/celebrity_slots_sweepstakes_listing_sites.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/ggT1V6M/tom_and_jerry_bike_race_game.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/0jj460s/povuzivi.pdfIn PDF document text
    • http://umkatrade.ru/coriolis_rpg_4chan6b7j9.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/95243145664.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/vipimexejikejozojufubab.pdfIn PDF document text
    • https://wazefiwef.weebly.com/uploads/1/3/4/3/134369298/kakofoziwusam.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://uploads.strikinglycdn.com/files/747b1532-56f1-41da-a938-5d35b71fdeed/wuzuwi.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/introduction_to_behavioural_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab543aa-5b6a-47cc-897b-9350a3254bb6/38257690975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d5f87d-572d-490c-b938-ae22e034dd33/summary_of_alex_rider_scorpia_rising.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 4776 bytes
SHA-256: 66b82e158b4da8127c00bbd8fdcd41582dd7384cb90de6114478647acc38042d
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 10716 bytes
SHA-256: eb04e5bfa81c2efc294cde9f9a6275e1554377342f93f4677f9e867fd6da8e34
font_02_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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