Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d74cec7cc90657…

MALICIOUS

PDF

74.8 KB Created: 2021-02-21 02:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9b93ee9d60b6f6b0c7acaaa31e6e4a32 SHA-1: 1fefe661a63780d0ac7c32e0eae726a7710451b8 SHA-256: 53d74cec7cc90657d29235e001563d461b6ccea03a1ad020b1357f6a59487b97
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious redirectors or part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'english speaking course in hindi pdf'. The presence of multiple PDF links and a critical heuristic firing for malicious redirector links indicates a strong intent to direct users to harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=best+english+speaking+course+in+hindi+pdf In PDF document text
    • https://cdn.sqhk.co/depifozopupe/5okKihH/vebunusininu.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/bejixegaba_zolakojobun_fofewofo.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/hdKibhc/picoseconds_to_milliseconds.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/woboxutob.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/jehMhjZ/valiant_hearts_the_great_war_review.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/NijiaxB/moto_bike_racing_stunt_master_2019_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/e14cC5r/toolwiz_photo_editor_pro_apk_uptodown.pdfIn PDF document text
    • https://ritosigom.weebly.com/uploads/1/3/1/4/131453630/gezuzotifine_zinurexuzawi_zijomutupodo.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/6n2ONgg/car_builder_games_online.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/gipanasuxaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/novifamigot/sipafalagesubiwoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/bihar_police_bharti_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/jemupujep.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/48458793061.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/gujarati_calligraphy_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/pezagokewep.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/51720712961.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/snow_white_with_the_red_hair_season_2_episode_2_english_dub_facebook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 5412 bytes
SHA-256: d2244d819fb895748bfa360c9b44c5e9ad51837135414b021b8bd629120b5e9e
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 10244 bytes
SHA-256: 91f2f7f5a551575b1bcf7def5e031bdbb905d613c0bb6d483342989c119ae3a4
font_02_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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