Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40f5831ed0adf5b…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 17:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: de73a7f315327f669887b8da4b689220 SHA-1: 71e0e96cc8a692367f6cf1729406442bdae6c474 SHA-256: f40f5831ed0adf5b3ea43ebd3ea4d2a38cc2a0417aff52102ee146e4bb7a4da2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a prominent one being `https://jumiwimov.ru/strik?utm_term=welcome+to+the+monkey+house+story`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` suggests the PDF is designed to host many links on disposable domains, further supporting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=welcome+to+the+monkey+house+story PDF link annotation
    • http://goxuvux.22web.org/gdb_gef_cheat_sheet.pdfIn PDF document text
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/gijakax.pdfIn PDF document text
    • http://top-shop-store.website/editing_picsart_background_hd_images_download_zipkorcc.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/zefefopilivib.pdfIn PDF document text
    • http://xuforixek.22web.org/portable_phone_charger_for_samsung_galaxy_a10e.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/3a260c2b8.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/GggLsji/dominos_pizza_near_me_delivery.pdfIn PDF document text
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/gefokewodabapal_lemumapuz_visoju.pdfIn PDF document text
    • http://kitigaw.22web.org/bhoothnath_movie_songs_free.pdfIn PDF document text
    • http://monongzhlh.space/normal_air_fuel_ratio_at_idleo46d0.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/tafelemafogevigumudu.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/93rNhb6/31853695840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_b14b216031b24e1f848f59d6a13122b1.pdf?index=trueIn PDF document text
    • http://tuzajobiwazotuf.epizy.com/50032436033.pdfIn PDF document text
    • http://ravuronexofu.rf.gd/bebiwoziwevolajod.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_0e18aa6902d84d4d81d7a266625d24fd.pdf?index=trueIn PDF document text
    • http://wiroweri.rf.gd/netflix_for_android_7._1_2.pdfIn PDF document text
    • http://difavaxegugadu.epizy.com/zunamimiwolatawawisawek.pdfIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_b6b6f315539e43d68854727fd04dc09b.pdf?index=trueIn PDF document text
    • http://fovodikil.rf.gd/can_i_use_my_own_router_with_centurylink_internet.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 5008 bytes
SHA-256: 47c336ba5c3586af2aa534e9bcead7cddf72c996883a441e8f35e0cfb039302d
font_01_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 11256 bytes
SHA-256: be3f6498eb1e94d3cf65026888d7d5a7c682a5826cf6f9f77d632f2af8897e76

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