Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2e51e7bf2dbf16…

MALICIOUS

PDF

70.9 KB Created: 2021-03-12 04:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f528691dc6a773880b3ac7362bb5fc4 SHA-1: b4bb27a30e4fd1bbbe143f6d88199242225a218b SHA-256: 1a2e51e7bf2dbf16e48582bdbb450aea3b0f622c1b60f99e33d8d6c6942942bf
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=chemical+elements+crossword+puzzle+answer+key PDF link annotation
    • https://cdn.sqhk.co/vomikigiw/SDkFzhc/4546707057.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/hidxjb6/happy_birthday_cake_topper_cricut.pdfIn PDF document text
    • http://lirepenepubejix.iblogger.org/24317195164.pdfIn PDF document text
    • http://nonly.xyz/xodagapesoxumujewoverns9w.pdfIn PDF document text
    • http://lakshmi-store.ru/vaxipivuregarosasodiwugesu2cw8.pdfIn PDF document text
    • http://madamzero.com/el_neoliberalismo_en_mexico_unamzugax.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/17761785975.pdfIn PDF document text
    • https://cdn.sqhk.co/fipexuwebo/YifmQGc/34228090985.pdfIn PDF document text
    • http://pipvip.ru/google_traductor_espaol_ingles_pronunciaciong3q22.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/diaCTjj/fapas.pdfIn PDF document text
    • https://cdn.sqhk.co/gumakulex/hchdZHK/all_creatures_great_and_small_2020_review.pdfIn PDF document text
    • http://gizaxeredemuni.22web.org/rang_barse_bhige_chunarwali_video_song.pdfIn PDF document text
    • http://termometr-medikal.site/38721522372dj0m7.pdfIn PDF document text
    • http://vir-tus.com/encyclopedia_of_life_support_systems_freefhwr7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mawokale.myartsonline.com/1349079226.pdfIn PDF document text
    • http://zibusawaf.epizy.com/nifuzeralonijesegole.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_5bca18e387e542819ea8e165534f9ae4.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_8200867ae25646a081df5ddb2c06054a.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_5aa44f96f60f4703b94c9358d3df582f.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_23e63da3d7014f27865f5428a471edf2.pdf?index=trueIn PDF document text
    • http://faxajipemafeb.epizy.com/3d_max_photo_frame_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 5528 bytes
SHA-256: 54e44b421cef9d22ed90f17efd046b671f1bfff98bede2bc6cb6be7e44b406c2
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 9748 bytes
SHA-256: 061e902b4d76725fcf09a595cdf7a0f4b1aa955ade527fd8e6bf2f93d777bd42
font_02_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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