Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b28b279cebf02d…

MALICIOUS

PDF

90.1 KB Created: 2021-03-17 10:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dd39ae2d3a006ae601c5f291da76d5a6 SHA-1: 565e963e76b91daf8c78b5b07f4751379b6f2c6b SHA-256: 72b28b279cebf02d9dacca31df087919ad5ae1dff1424f4a9ffe1b07a3f10747
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 0.9997

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://resalured.ru/123?utm_term=brahmotsavam+songs++now PDF link annotation
    • https://cdn.sqhk.co/mivuxakadu/Tp9A4gg/nasty_gal_dresses_ireland.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/sunitawi.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/oxford_bookworms_starter_level.pdfIn PDF document text
    • http://moperala.iblogger.org/batch_production_control_record_format.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/yNcvhg5/geometry_dash_world_download.pdfIn PDF document text
    • https://cdn.sqhk.co/muzubasiwu/sjbhfml/national_defence_academy_courses_after_12th.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_f70f961aee384c6290ed88ba6d122066.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_3900ad4a8bd246d99e679be661d8d942.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/4108274833.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_45210288a89b48369ba3d1b4ad60602f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff74b619-e5b1-4faf-a00f-ef7a4fe044e1/besul.pdfIn PDF document text
    • http://gedikoti.epizy.com/old_huckleberry_finn_book_value.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/android_busybox_static_binary.pdfIn PDF document text
    • http://duvugagaxanawag.rf.gd/85854074565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be72adde-b2aa-456a-b9d3-60dc0aecc1e3/how_to_remove_moen_faucet_aerator_that_is_stuck.pdfIn PDF document text
    • http://duxurajixi.rf.gd/14710678666.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/how_to_update_fire_tv_recast.pdfIn PDF document text
    • http://sujetokotew.rf.gd/tivevaripinafum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8703532-b0cd-4981-ac39-96afd5be4f2e/21402245467.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_8a95c20721d0448ea8e383a59bebbce1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25a5326-cd68-43a6-aef0-0603576dad37/possessive_nouns_examples_2nd_grade.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_off00012516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 5268 bytes
SHA-256: 1f69c99efc38c66215070deb69a385987883e3d5ebad9c3c1d0db6bc9e39faaa
font_01_sfnt_off000136ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EA 11004 bytes
SHA-256: 216de1f505710428db11f62bfa1da4fca7025f50249ad7bb4c4e59ebf2e39ab3

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