Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3d4006519f248b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-02 22:34:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d2ec831af26fe0fbf17672f09d1aebb9 SHA-1: c92097dd97a791b8b9e417f1244c9c08e58fd57b SHA-256: dc3d4006519f248becb5783c03ab8459f5eb98d2e5181752ca23bcf8128e1cb7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains and configured as link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=nickels+understanding+business+the+core+1st+edition+access+code PDF link annotation
    • http://jofufunobek.sportsontheweb.net/hayward_ecostar_drive_error_pump_has_stalled.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/8965485.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/amplificador_de_instrumentacion_ganancia.pdfIn PDF document text
    • http://trycabinets.xyz/how_to_hard_reset_hp_officejet_pro_8610kufst.pdfIn PDF document text
    • http://vereffka.xyz/the_room_where_it_happened_bookapy1c.pdfIn PDF document text
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/ba0c2.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/66924318804.pdfIn PDF document text
    • http://onlyforyou.space/what_are_the_twelve_maxims_of_equitymxbhx.pdfIn PDF document text
    • http://uchebnoe.website/lugodilatonamogakuzdphj.pdfIn PDF document text
    • http://roskycnmx.com/tijofuziditebuxutogi0tyx2.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/wisomuzaxivujusojona.pdfIn PDF document text
    • http://quickstore.pro/shimano_di2_installation_toolrxhiz.pdfIn PDF document text
    • http://znakomstva18x.site/vofiduo2j0.pdfIn PDF document text
    • http://galoomer.online/79998790337b8svw.pdfIn PDF document text
    • http://fherixq.com/ordinary_synonym_crosswordhns8i.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/wifiduxezo/is_padi_open_water_difficult.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/36587825724.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/bridal_shower_gift_list_template_free.pdfIn PDF document text
    • http://wigikel.rf.gd/a_dolls_house_1992_full_movie.pdfIn PDF document text
    • http://monofetifalo.rf.gd/legal_due_diligence_checklist_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 5424 bytes
SHA-256: 185d6c44ca4042176d6c25e2e07cb561a1f4d75c0cc721e81e2efbcc32847b8b
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 11724 bytes
SHA-256: 5d19487d91a3034f3081723e7dcfe424f3a3346990f167ce344113eb3cfd224e
font_02_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 16084 bytes
SHA-256: 29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10

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