Malicious PDF — malware analysis report

Static analysis result for SHA-256 5713c24e566fa912…

MALICIOUS

PDF

81.9 KB Created: 2021-04-07 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55dc2dc204e2c3a60f4e5527fb542cf SHA-1: 75b97e3a578fbfad9cb0860d0380cb54aa05d7e3 SHA-256: 5713c24e566fa912d2d8e3dbdbd5a054df6794a61187d2d29847bfb1431f31bf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=masterbuilt+mps+20b+patio-2-portable+propane+smoker+reviews
    • https://cdn.sqhk.co/xuvuxemoguf/gejUFjj/75842470368.pdf
    • http://carluxepaint.site/the_art_of_business_communication_graham_shaw_downloadn7xav.pdf
    • http://smallita.space/dusepatyrw44.pdf
    • https://cdn.sqhk.co/jezaziritav/djiRjbd/49124009087.pdf
    • https://nozipukox.weebly.com/uploads/1/3/6/0/136057246/d98bc466b13.pdf
    • http://mainsale.pro/princess_diaries_2_full_movie_with_english_subtitles_downloadgqeu3.pdf
    • http://prostotit.site/why_he_disappeared_bookkt22q.pdf
    • https://cdn.sqhk.co/pigalixow/i8stZmD/mekaposobe.pdf
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/nonakuz.pdf
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/nebazazatipom-sufaroku.pdf
    • http://azules.ru/xepakorapudgql6m.pdf
    • https://cdn.sqhk.co/molodomo/mmhaicf/enemy_strike_download.pdf
    • http://blockhcain.host/how_much_dna_testing_costsxq0f.pdf
    • https://gererojakomez.weebly.com/uploads/1/3/1/1/131163960/7376006.pdf
    • http://grigolia-studio.ru/53947005925n5nzv.pdf
    • https://nibovipuduri.weebly.com/uploads/1/3/0/8/130814681/2320683.pdf
    • https://cdn.sqhk.co/fogunedevare/cjjbib5/uncertainty_avoidance_examples_in_japan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nufidibodudulad/how_to_write_a_paragraph_about_my_pet.pdf
    • https://s3.amazonaws.com/fadupazageraf/decimal_multiplication_worksheets_for_grade_5.pdf
    • https://s3.amazonaws.com/ninazarila/bithiri_sathi_dj_songs_ing.pdf
    • https://s3.amazonaws.com/sixenogafopoj/11_std_tamil_guide.pdf
    • https://s3.amazonaws.com/gavapozalilup/70571326316.pdf
    • https://s3.amazonaws.com/sedimeraxufi/video_maker_software_free_for_pc.pdf
    • https://s3.amazonaws.com/sukobogixe/39369776001.pdf
    • https://s3.amazonaws.com/buwosevax/ethiopian_orthodox_amharic_bible_online.pdf
    • https://s3.amazonaws.com/pazerogasarinu/kiwapuwiwo.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_off0000ffda.bin
f94bfb93b7ffd4e2d03e48bb5f349a4b47d5a9be22d8a7d67cd31835f85bfcf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 5632 bytes
font_01_sfnt_off0001130b.bin
061d621752177869546f3ea5bf21275bed1bb778407f08851141421014e58ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 11308 bytes

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