Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb73eeeb668c70f…

MALICIOUS

PDF

69.8 KB Created: 2021-02-22 13:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d92a60eb033c05d6771e9495a34f1d95 SHA-1: d0cbecf7972c4f6c46a6ff80399cab5d88b3ba54 SHA-256: 1bb73eeeb668c70fe7e3101f780e60b01776fed5990f00ef1b31602daacf889d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL is flagged as a potential phishing lure related to printer ink cartridges. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=hp+officejet+pro+8500+wireless+ink+cartridges PDF link annotation
    • http://wgathering.org/66350633181658r3.pdfIn PDF document text
    • http://hurricane1.space/4137940951zethz.pdfIn PDF document text
    • http://nextauto02.ru/keystone_algebra_1_geometric_sequences_answers25ixa.pdfIn PDF document text
    • http://autobaff.xyz/sasara8bnon.pdfIn PDF document text
    • http://duplicwcnj.space/saxofodufubevbuitb.pdfIn PDF document text
    • http://fabermanufacture.ru/raiders_march_orchestral_score73a5b.pdfIn PDF document text
    • http://tezosomebapixim.22web.org/vpn_free_ios_apk.pdfIn PDF document text
    • http://copyright-services-us.com/latest_bollywood_movies_songs_albumalt51.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/jh7PAij/free_music_download_online_no_sign_up.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/gg1jdmD/chain_reaction_movie_motorcycle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupisovid.epizy.com/mabab.pdfIn PDF document text
    • http://japusorusepex.rf.gd/79240635745.pdfIn PDF document text
    • http://lobosenus.epizy.com/wikutawodoxubotu.pdfIn PDF document text
    • http://povuputuk.epizy.com/nouns_adjectives_verbs_and_adverbs_worksheet.pdfIn PDF document text
    • http://fazetotunoju.epizy.com/77803588972.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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 5976 bytes
SHA-256: bfb153442ffb50885896ccff1ee43ef2ced3c5ffd20413ba76b2f3f0e732b4bc
font_01_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 11028 bytes
SHA-256: 758c22d4bd119ee98a3290969de665a5a70b88579f05bfb2b0c7e21573343625

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