Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c81ea583b10815f…

MALICIOUS

PDF

74.9 KB Created: 2021-04-06 12:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b7b70641c0c50a7d94bd7dfed412ea25 SHA-1: 57782e17bdedf41101bc2898aff86d0600569a49 SHA-256: 3c81ea583b10815fb5267fad38a5976d8c3aadaf026d476ea4ff956ea0da8cfd
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to 'blogging for money', likely a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/award?keyword=blogging+for+money+pdf PDF link annotation
    • https://fagadiroduk.weebly.com/uploads/1/3/0/9/130969360/godirasizagu_xowabibu_josanazu.pdfIn PDF document text
    • http://idealslimitalia-official.site/verbos_en_ingles_pasado_presente_y_futuro_para_niosfg3et.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5fe4132f0f0ca.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/0shbsgd/red_sunflowers_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_60681e2512fa8.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/hbghjeE/virtual_music_mixer_dj_pro_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/ghmqlRb/one_piece_treasure_cruise_all_characters_list.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/aaea921e25.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/2310886.pdfIn PDF document text
    • http://igoscandinavia.com/honda_zoomer_x_service_manualanfb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_600cfa22be617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392207/normal_60013c0bcda91.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/finojethzft6.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/9bacb5df.pdfIn PDF document text
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/97ca8fc7f00.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/how_to_make_dunkin_donuts_frozen_coffeejngrv.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/jVhbxAv/bowutomokagosofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_603149d0b87d5.pdfIn PDF document text
    • http://copyright-help-center.com/android_tv_box_wifi_remote_appxm1r8.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/7485c1e4-4c16-47dc-8fd9-43b52cd4ff47/2012_hyundai_sonata_hybrid_actual_mpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c49ef5-7135-4a8a-964d-393f924da5c7/why_is_my_hoover_steamvac_leaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7e6037-5ec6-41e6-93e5-e92fa9d5dd84/rockwell_delta_model_40-440_scroll_saw.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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 5124 bytes
SHA-256: c31fd4a8ca74d2688ca467e85b65c5929af56cec19849cc01af266b20216fdbb
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 10940 bytes
SHA-256: d5d496b6dcef817a794aa76eda74a5edd3480ade2119aab85db5cae07a839be1

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