Malicious PDF — malware analysis report

Static analysis result for SHA-256 710d3c89407a7ae4…

MALICIOUS

PDF

69.5 KB Created: 2021-03-31 01:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a602eb5d8f19732b7d8f66853c60a3f6 SHA-1: 7af0278bd283573458c986de12129f15549e5da8 SHA-256: 710d3c89407a7ae41cb493dd26289bbf21cc8ba3d5664be05be602f870ee88f2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to other PDF documents hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a potential SEO manipulation scheme or a distribution point for further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-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://kuzutuzo.ru/award?keyword=bajana+songs+pdf
    • http://faripofijukevom.mywebcommunity.org/13070031943.pdf
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/c2dedddee.pdf
    • http://tozidak.mygamesonline.org/cesur_yeni_dnya_trke.pdf
    • http://kupimaxi.sportsontheweb.net/english_speaking_topics.pdf
    • https://cdn.sqhk.co/jivonaxadu/O7ijifL/redubadebar.pdf
    • https://cdn.sqhk.co/tofigidukug/pfSgjYR/stumble_inn_sunderland_menu.pdf
    • https://bikafosujikus.weebly.com/uploads/1/3/2/8/132815014/8501217.pdf
    • https://cdn.sqhk.co/lovojekaboxi/cKUsgiL/hashtags_on_instagram_for_artists.pdf
    • https://cdn.sqhk.co/vovigewuva/oWMnv6W/bootstrap_4_header_template_codepen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_0986043e18a24f2d9bdd0a5fda443e23.pdf?index=true
    • https://s3.amazonaws.com/zozuxukoxo/bootstrap_template_maker_software.pdf
    • http://lafagelupuf.myartsonline.com/kuxipilugane.pdf
    • https://s3.amazonaws.com/jewizopukuni/47851961429.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_2ff9742fccfd476a8ec988850a24f255.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_9023c2c3a1a1467c87ca74da9d4825c7.pdf?index=true
    • http://lapetagalelan.myartsonline.com/lg_ducted_fault_code_ch_52.pdf
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_a79143dc6074404581451d83ef4daebb.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_53013a37b49245068a85c258b6e69090.pdf?index=true
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_fbcf0a5281fd4b92a5396b8961d5defd.pdf?index=true
    • https://s3.amazonaws.com/sorogamat/what_are_the_different_traditional_music_of_africa.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_off0000d07d.bin
c0363a56c3887a5a2911e47c7e6c365b5445c703f860dc955c8cebd54e8d3907		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 5204 bytes
font_01_sfnt_off0000e255.bin
545d034e30e1531f87c73afe310053398198da06ff33f484d874d40644c10486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 11812 bytes

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