Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b8a5412a928eb5…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 08:37:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7be33aec201e2c6a511ee4efe231d5f5 SHA-1: b1ee36307b9cd441e9dd66198a1ff00a5189101c SHA-256: d7b8a5412a928eb50b55d1f44c34508e56910fb7750b694c931f365a4ed80aaf
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to distribute malicious content or phishing pages.

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/aws?utm_term=tres+metros+sobre+el+cielo+sequel In PDF document text
    • http://magnetfix.store/honda_lawn_mower_parts_dealerue8b0.pdfIn PDF document text
    • http://sokfresh.fun/exercicios_de_torque_e_alavancagxs7a.pdfIn PDF document text
    • http://gelchlen.fun/quran_tafseer_commentary_in_english_audiomwp2z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_603f19af36bd7.pdfIn PDF document text
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/71ea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_600294d7c228d.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/lizinabevujede.pdfIn PDF document text
    • http://tameenegypt.com/rob_bell_what_is_the_bible_study_guidelp9eq.pdfIn PDF document text
    • http://parkingtest.xyz/8026956654973u59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384459/normal_5ffa81efd8419.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/wonumafubij/fexoluwixamigorufudu.pdfIn PDF document text
    • http://gazepofibugas.epizy.com/chromebook_os_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/bmw_s1000rr_hd_wallpaper.pdfIn PDF document text
    • http://vejobewibibir.epizy.com/57548543712.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/1084886224.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/ged_science_practice_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/vim_cheat_sheet_filetype.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_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 4948 bytes
SHA-256: a1775b765aef18d31787fb19ec820cdd9b6ba625e1c6642965b9390a2e65eed0
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 12060 bytes
SHA-256: 16192ae137c386d2c9777468ce6c8f49ee08e65334a86b37f0119e558e36eafa

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