Malicious PDF — malware analysis report

Static analysis result for SHA-256 756ec7a2e18329b5…

MALICIOUS

PDF

72.7 KB Created: 2021-03-29 20:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d22d62e8c7b6a49efec0a1775fa6b57b SHA-1: 497a582812caec58fe96dbb8014eb6faceda4477 SHA-256: 756ec7a2e18329b5a9c5df6b44fb9c9e4ebb8b4ff9130dbe20a948a45c8ff113
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 domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=bacterial+transformation+process+ppt PDF link annotation
    • http://bivaxosufuxibo.mygamesonline.org/how_to_reset_schlage_master_code.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/94284608771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_60303510dca8d.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/87891501235.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/the_half_blood_prince_part_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421473/normal_6002c32938ac2.pdfIn PDF document text
    • http://robinmani.site/chick_fil_a_calorie_calculator155fv.pdfIn PDF document text
    • http://golden-bridge.pro/how_do_you_write_a_descriptive_narrative_essay_with_dialogueiyh6w.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/cpu_not_turning_on_and_power_button_flashing.pdfIn PDF document text
    • http://sifimuv.iblogger.org/red_bull_company_profile.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/jifofasabama.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/book_reading_comprehension.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/41732f13-328c-4aa3-9332-18a5cf01cd22/zexivafumev.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/angiosperm_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3416814d-eaac-4ce2-97dd-8202ccd4752c/medar.pdfIn PDF document text
    • http://gukabusigutuwo.epizy.com/cours_analyse_2.pdfIn PDF document text
    • http://mavipob.epizy.com/84218977113.pdfIn PDF document text
    • http://ralomefin.epizy.com/thriller_album_video_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f837f488-54e4-4364-8a59-19092272f5b8/what_is_meant_by_a_sensory_details.pdfIn PDF document text
    • http://befojarariwowab.epizy.com/77947707262.pdfIn PDF document text
    • http://runuwug.myartsonline.com/sekiro_lady_butterfly_easy_cheese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15a08bd-4214-4f0d-bb54-3b242b5f6340/kroger_blood_pressure_monitor_error_3.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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 5212 bytes
SHA-256: bebe1df9e71fa51c1240926bce690d161bc92ca2c0e4ba4b69a21691d8099984
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10728 bytes
SHA-256: df24402445d973bb92246eba7c0cd17b501d85cffc3f73cf4e900b169cb84c86

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