Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f31cca61238b8a5…

MALICIOUS

PDF

78.5 KB Created: 2021-04-03 20:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf1c2d3d413154463bcb7628e8c3866 SHA-1: d2c56d05944aa554371a9a8c5c80cde5aaf8fdec SHA-256: 1f31cca61238b8a54a17fbb0a50899e7fe556ed0f5f743cf371c064eb650fe01
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=subtracting+decimals+worksheet+for+grade+5
    • http://qqkaxes.xyz/sipuwumexutemewm82b.pdf
    • http://matcobzor.ru/fivawofizivajitjug4w.pdf
    • https://cdn-cms.f-static.net/uploads/4456712/normal_602a10cb46ec5.pdf
    • https://cdn-cms.f-static.net/uploads/4366381/normal_6020cf482ec2d.pdf
    • http://interior.estate/checkers_near_me_nowif2zh.pdf
    • https://static.s123-cdn-static.com/uploads/4459176/normal_600392922c32e.pdf
    • http://verifiedbadges-form.com/castillos_de_hielo_partiturae4z26.pdf
    • https://static.s123-cdn-static.com/uploads/4477155/normal_5fe3061b32b96.pdf
    • https://cdn-cms.f-static.net/uploads/4473031/normal_604510db6e309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fexuror/mexog.pdf
    • https://uploads.strikinglycdn.com/files/b93dd637-b848-40fb-a309-60aa7780479b/mupinojumugofib.pdf
    • https://uploads.strikinglycdn.com/files/015f2e58-00da-45ca-984c-8264389a77b0/local_economic_development_definition.pdf
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_1b5b97ccac1e48268c45b9db691f1959.pdf?index=true
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_d2fc8ba158b348ec83aeaa96e28bbfd2.pdf?index=true
    • https://s3.amazonaws.com/fatisake/angular_format_currency_locale.pdf
    • https://s3.amazonaws.com/zexozavo/social_media_marketing_a_strategic_approach_2nd_edition_free.pdf
    • https://s3.amazonaws.com/wanasuvedigo/38486549263.pdf
    • https://uploads.strikinglycdn.com/files/13ac2fe8-a28e-4d27-b9a3-e47bacf2b4a8/67382076673.pdf
    • https://s3.amazonaws.com/baxunaf/grammar_book_blue_skies_for_bulgaria_for_the_3rd_grade.pdf
    • https://s3.amazonaws.com/tobojelusiwi/vemugerimesaluguxazi.pdf
    • https://s3.amazonaws.com/zifozujiwi/what_do_you_eat_on_the_mediterranean_diet_for_breakfast.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f4.bin
681e23f6603f744f746d00a40ebfee4e614b53e02b51aed4df7645803995150b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 5960 bytes
font_01_sfnt_off00010724.bin
0dffd1b7fb5c55f6426b07c069ff177371949a2dfd16b4ad29c9e4959ee9f2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 11060 bytes

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