Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f88a9ac8d5509b1…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 09:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c80975db5fc4952c1cc53bb3a330cf3b SHA-1: b0fbb7c6093224bb135827372b201ec350f74276 SHA-256: 4f88a9ac8d5509b13f8e5aceb5c13020291aabb789a5d3bbfc29218fc376d7da
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://golowaki.ru/strik?utm_term=corporate+communication+skills+definition PDF link annotation
    • http://namelesssouth.xyz/chinese_action_movies_freeab7vv.pdfIn PDF document text
    • http://jekigun.22web.org/mathematician_names_and_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_6026ed22b00b3.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/sanford_guidelines_for_antimicrobial_therapy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410190/normal_6000670c21cfc.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/antenatal_visits.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/17523848205.pdfIn PDF document text
    • http://subaxidubuju.22web.org/what_is_collect_like_terms.pdfIn PDF document text
    • http://vitalia-transports.com/elie_wiesel_night_downloadk56yv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470535/normal_5feee63bce00e.pdfIn PDF document text
    • http://towonededuv.medianewsonline.com/antisocial_y_asocial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fe0b1cbc560e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5fdeffe2d49dd.pdfIn PDF document text
    • http://vonezejavej.22web.org/53412432717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivadanoxibive.epizy.com/beginner_running_program_over_50.pdfIn PDF document text
    • http://rigelosatabureb.epizy.com/google_play_chrome_android.pdfIn PDF document text
    • http://bubewap.rf.gd/gemischte_brche_division_aufgaben.pdfIn PDF document text
    • http://bonagofej.epizy.com/kumevulimoluwozoliroputur.pdfIn PDF document text
    • http://duvodix.myartsonline.com/periodic_table_trends_test.pdfIn PDF document text
    • http://pedefulavok.rf.gd/62565055994.pdfIn PDF document text
    • http://gisivem.epizy.com/46085529415.pdfIn PDF document text
    • http://jifunujori.rf.gd/piruvenokotetu.pdfIn PDF document text
    • http://tumitodutib.rf.gd/advanced_medicinal_chemistry.pdfIn PDF document text
    • http://kuporalegumema.epizy.com/gulokivepovizidexima.pdfIn PDF document text
    • http://segukilu.epizy.com/aristotle_onassis_biography.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_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 5268 bytes
SHA-256: c2f66e4505e11fa2792cf7e07bf4edeb1e24d7f5e877fb5b04f5d2fd0b291b48
font_01_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 10352 bytes
SHA-256: b5f22ece73ef3062797a4b8a46ecc67dab0cf099e9908f2cc2acce89afae5192

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