Malicious PDF — malware analysis report

Static analysis result for SHA-256 405caf64fb98ecab…

MALICIOUS

PDF

78.6 KB Created: 2021-03-03 03:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82866d11e3400cdd44c3fcf5fcf998c5 SHA-1: 5cd1ca0ffae9f4c341cfc82265ea8c345853427b SHA-256: 405caf64fb98ecaba86bbb943a4fbb161cb85f8e965c8943854660570a027b74
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including one disguised as a PDF download, suggests a phishing or social engineering attack aimed at tricking the user into visiting malicious sites or downloading further payloads. The document body, though heavily obfuscated, contains metadata that does not align with typical document content, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wb?keyword=yaesu%20vx-6r%20freeband%20mod PDF link annotation
    • http://santand-es.com/apc_smart_ups_1000_wont_turn_ontsh8b.pdfIn PDF document text
    • http://sexesex.site/how_to_use_ergobaby_360_with_newborn_insert3f6sp.pdfIn PDF document text
    • http://elerctum.org/warudizarud79c8l.pdfIn PDF document text
    • http://dress-russia.ru/judicial_branch_scavenger_hunt_answerslw875.pdfIn PDF document text
    • http://matcobzor.ru/lagu_waktu_yang_salah_metrolagu42ws4.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/norton_reader.pdfIn PDF document text
    • http://kewotij.mypressonline.com/still_alice_movie_online.pdfIn PDF document text
    • http://rusakova.space/zulotitefag3oopg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fe08d4ebf5c0.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/why_is_my_hunter_fan_light_blinkingdam97.pdfIn PDF document text
    • http://pressit.fun/sapezizoxoxuligeki6jx2o.pdfIn PDF document text
    • http://j3vnci4.xyz/nordictrack_audiostrider_990_repair57wn0.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/morexekazubijofowomoru.pdfIn PDF document text
    • http://organic-ita.space/vokirumaduxepunrrjs7.pdfIn PDF document text
    • http://dom-bita.org/evaluacion_tipo_ece_de_comunicacion_para_tercer_gradoonyhi.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/96865644499.pdfIn PDF document text
    • http://cmb-accueil.com/111975615465d0jr.pdfIn PDF document text
    • http://storedubai.shop/30897309901ca111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pudolajuji.atwebpages.com/xbox_one_controller_wont_work_unless_plugged_in.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_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 5436 bytes
SHA-256: e016d772050a302318ea4fd4f06d8f041f28a40a00f8d3be379ea81ed59c6bb7
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 10556 bytes
SHA-256: f2e87c0a0bd1d62f3bc32f2dca948a7ea0d8c8ccf45d526dac065b8614c0357b

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