Malicious PDF — malware analysis report

Static analysis result for SHA-256 323b0f8eedb9fba4…

MALICIOUS

PDF

78.0 KB Created: 2021-04-25 23:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8454fac2585f8f89b2290b85c0a262e6 SHA-1: f1dfcef37e543b3d7782f0a4afdd7e0bc04c0968 SHA-256: 323b0f8eedb9fba4120766ede09f0adb8b73f623a7a85c43a2b7f10a30f37ccb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also strongly indicated maliciousness. These links likely lead to malicious content or phishing sites, and the document's purpose appears to be to distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://kuzutuzo.ru/strik?utm_term=que+es+una+base+en+quimica+y+ejemplos PDF link annotation
    • https://cdn.sqhk.co/gapebeve/hgh29yt/pobufanik.pdfIn PDF document text
    • http://operationhomeplate.com/masione_mouse_driveripcfv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_5fdb822fcc015.pdfIn PDF document text
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/janut.pdfIn PDF document text
    • http://o-karte-kopilka.com/begivaps7kng.pdfIn PDF document text
    • https://tojejalunegod.weebly.com/uploads/1/3/2/7/132710717/1abf867a0cd8b6.pdfIn PDF document text
    • http://freedate18.xyz/kiwekixogunibesefuz9w8mx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_60271060068f4.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/hcgdyjj/real_car_parking_parking_master_apk_mod_download.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/limukoxojogoju_pobonawetaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_6067c08bab8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_5fe6f09d24699.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/qJjagh0/mx_player_apk_for_samsung_smart_tv.pdfIn PDF document text
    • https://xoxisutebigag.weebly.com/uploads/1/3/1/4/131453062/6aa7a.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/gjkshcj/nba_2k20_best_hop_step.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/HiisCBY/usher_romantic_songs_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/lJIvgfr/sports_bike_wallpaper_hd_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/YMgihTi/38564409639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_6064fa3462d9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9813b730-975a-4463-b495-c7bd8826b036/kexofulexulasekixetov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962e2955-82ba-4663-b6b9-bcfd51426683/how_many_sight_words_should_a_2nd_grader_know.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2feef130-9f8d-47b9-a09b-31b0ad0d2f62/45627575277.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_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 5488 bytes
SHA-256: bf48f33a76ea108d6ff9d204a238bf9cecf473ba29c923372cd0c95b88b13c10
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 11940 bytes
SHA-256: a64004dc1f1cbdabe4f6d7bb4669ec4930c851e0540f8fb8dd4954cad2d2627c

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