Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f72f890a47a2f4…

MALICIOUS

PDF

78.8 KB Created: 2021-05-15 21:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 496ce3203eb1881e54a6ece5fe7ccfd1 SHA-1: e3e378fdbbe80da40447e643db006215d147fb64 SHA-256: e3f72f890a47a2f464d2b31760a288cf6781f366f385112c4df62bf5363926cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/strik?utm_term=my+netgear+modem+stopped+working PDF link annotation
    • http://guwumuwepoxujog.22web.org/wuvilewipog.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/bluestacks_android_emulator_for_pc_windows_10.pdfIn PDF document text
    • http://bbcua.site/experience_human_development_13th_edition_free_downloadg5kep.pdfIn PDF document text
    • http://nukels.xyz/frozen_hazelnut_coffee_dunkin_donuts_nutritionk3sdk.pdfIn PDF document text
    • http://mitisobixarof.iblogger.org/piwupikozefab.pdfIn PDF document text
    • http://usesalle.xyz/think_like_a_freak_chapter_3_summary81j46.pdfIn PDF document text
    • http://dakavol.22web.org/american_psycho_kitap.pdfIn PDF document text
    • http://axecheat7.xyz/nba2k15_vc_generator_no_download_speediz6aa.pdfIn PDF document text
    • http://ecosbor.net/america_west_side_story_violin_sheet_musicorirs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zopenave/99632217861.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_481996ce2b684bbeb5ccdb42364e5c89.pdf?index=trueIn PDF document text
    • http://vanowawupusizi.rf.gd/68198643407.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_e2a96e0c5b5640c0b12bc4cd1c3cbaef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/oxford_english_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/48874857049.pdfIn PDF document text
    • http://toledufebemal.rf.gd/aguda_llana_esdrjula_online.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_cb5b7da3496b42e0a684c55a671fd10c.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_17fc00e8c55d48ad98c425d3683ce6e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabom/pikirikojofepib.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/linear_and_exponential_functions_worksheet_answer_key.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_eac5b72f8b714170b4e13f4ff787fffa.pdf?index=trueIn 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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 5512 bytes
SHA-256: ca7fa46174564fa33a3b992b60c1e5053a2be46a52fe9245e1d1db3b330770ea
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 10856 bytes
SHA-256: c260c9e772f96b7557c8e0bf4e59de819c9170940628830bbb8cef88ad7f7281

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