Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a0eeb46ad2a771…

MALICIOUS

PDF

71.1 KB Created: 2021-03-05 22:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c3f4fa6072d3d04b4a10054504cbcfa SHA-1: e1c76a2bd836c2ee4dce4049a392602bb253b574 SHA-256: 31a0eeb46ad2a771629c551673c5b68c3196009faeb7de4adc810b045c03e7f9
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as https://botokaw.ru/wix?keyword=electrical+transients+in+power+systems+greenwood+solution+manual, likely lead to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/wix?keyword=electrical+transients+in+power+systems+greenwood+solution+manual
    • http://pixell.store/delevibogocs97w.pdf
    • http://reactivaperu-viabcpi.com/rovemuzikutusexepatfm80.pdf
    • http://torchqbfl.fun/field_of_glory_empires_decadence_guide3ox88.pdf
    • https://cdn.sqhk.co/tibidimewako/dGO05hi/sniper_ghost_warrior_2_full_walkthrough.pdf
    • https://cdn.sqhk.co/rigizisojix/NcXhcO3/slenderman_hide_seek_online.pdf
    • http://mojipasi.22web.org/golds_gym_450_treadmill_walmart.pdf
    • https://cdn.sqhk.co/vefapatape/hj65r17/air_france_flight_ticket_status.pdf
    • http://lowufadit.scienceontheweb.net/how_to_check_serial_number_on_laptop_lenovo.pdf
    • http://rolopigabetitu.scienceontheweb.net/vofomotizopikala.pdf
    • https://cdn.sqhk.co/lerotakisisa/egdnijU/xozewobaposaxeweso.pdf
    • http://vasakuso.sportsontheweb.net/kazodupegaz.pdf
    • http://jorowijedo.mywebcommunity.org/67342080523.pdf
    • http://javebamugizal.66ghz.com/20922536494.pdf
    • http://qwert-ita.fun/82632948357uaoxo.pdf
    • http://zixivudu.getenjoyment.net/42909022902.pdf
    • http://arfeshome.com/paladin_5e_dnd_spellsk3c5r.pdf
    • https://cdn.sqhk.co/xafiguzi/gcjd2ig/t-_mobile_money_customer_service.pdf
    • http://vopugixeroramox.medianewsonline.com/16704571708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tewidunutazi.rf.gd/meal_plan_for_bulking.pdf
    • http://deniketeza.rf.gd/54133367882.pdf
    • http://zumojuluru.epizy.com/76033136933.pdf
    • http://tanasebebibe.epizy.com/convertir_tazas_de_harina_a_gramos.pdf
    • http://vikaviruvumuz.epizy.com/kesetinew.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c95a.bin
996738b63b9a4afe6b24186703b4dbb0ea8a7ead580977efecb2e454f2c6d66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 5428 bytes
font_01_sfnt_off0000dbc0.bin
64504dad14c7540a22e5aa9dcb3f249455d932d581a741d5aa4ce08e426bc615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10580 bytes
font_02_sfnt_off0000ffed.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 4324 bytes

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