Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fcea36c2fa4299…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 22:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d73991e31cceba4dd02c521ad837a54 SHA-1: 146f4f4ff49b6d66d85c87044280cfdc6ee98c74 SHA-256: 48fcea36c2fa429978309f18570cd6990b6304a1c6930ca71c62af6752ba25f5
186 Risk Score

Malware Insights

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

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 0.9994

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/award?keyword=feb+2020+calendar+kalnirnay+pdf PDF link annotation
    • http://gajonedorebuko.mywebcommunity.org/bazivesazuwunuguzela.pdfIn PDF document text
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/15b146fc50f.pdfIn PDF document text
    • http://proita.fun/jojerapifds04g.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/war_and_peace_movie_1966_watch.pdfIn PDF document text
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/rigugolidam_fafalulikis.pdfIn PDF document text
    • https://sokijotebeveme.weebly.com/uploads/1/3/4/7/134767098/kogigonog-gunimire-xobop.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/fundamentals_of_machine_component_design_5th_edition_solutions_scribd.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/dazam_kejanijutasi.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/af56dfb7.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/tolstoy_war_and_peace_synopsis.pdfIn PDF document text
    • https://mapokelamoda.weebly.com/uploads/1/3/1/8/131856574/916cd712fc.pdfIn PDF document text
    • http://mesretly.xyz/intercultural_communication_7th_edition8fs43.pdfIn PDF document text
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/f5a0fdcf8b4f831.pdfIn PDF document text
    • http://storedubai.shop/catholic_mass_word_search_answers78god.pdfIn PDF document text
    • http://replyua.site/vmware_srm_interview_questions_answers_explanations79jli.pdfIn PDF document text
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/8445251.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/gutadokilolela_malojaxozitiba_sefubudofama_ragekizejog.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/7973111.pdfIn PDF document text
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/zixutalalajux_jojirexume_wosim_kiwabamojedobi.pdfIn PDF document text
    • http://ionatr.space/zigejoxewinoromekiwoeenjl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_67cbaf4a141b41c6a6e6cf527e989651.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_68a44cf7336541a396c9612cf1977e57.pdf?index=trueIn PDF document text
    • http://tuzuxutetug.atwebpages.com/wuseximokuw.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_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 5508 bytes
SHA-256: 6715e1ba27526d446b00654cbf4e4c2504c005434f3262cf2e78d1366e20e16f
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 10976 bytes
SHA-256: e7baa4d71850b1f19fdebc0cc8d15eb246c824e32380bfb689a8728c4e6393ec