Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc507fe6286efb42…

MALICIOUS

PDF

76.3 KB Created: 2021-05-06 04:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a99af7025d1cf4fbf96141442ea76291 SHA-1: 29d8691a56c108721fed1d3f148c593dd073843e SHA-256: dc507fe6286efb428cd170f357efa08511d0c2fc0a205f314246c3d0c9e06cf3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/strik?utm_term=what+is+shelf+life+of+organic+milk PDF link annotation
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/c43ca.pdfIn PDF document text
    • http://mebowakop.22web.org/ketosun.pdfIn PDF document text
    • https://cdn.sqhk.co/sesekopusoj/EhjTja5/vunubinoriperan.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/gqV1tie/78959653158.pdfIn PDF document text
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/jemusekoz.pdfIn PDF document text
    • https://jedumetunu.weebly.com/uploads/1/3/5/3/135388943/milokawuvavakup.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/rimopipisodazebog.pdfIn PDF document text
    • http://ladunalufim.iblogger.org/44887533266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_b74ea176c48640a29b056ba9ee7195ea.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_0708d0b188b9471a87013ebb291668d9.pdf?index=trueIn PDF document text
    • http://fifoxadubote.rf.gd/66242765475.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_e60a0393d13d4296a7a6457218555c1d.pdf?index=trueIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_33bc11da8ff746e6b6b6c4cad623df09.pdf?index=trueIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_7846a40966db42639ee12ce95ff093bb.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_fded44a48e8a4f6d9d5bd62475598baa.pdf?index=trueIn PDF document text
    • http://dunupilopun.epizy.com/fun_math_activity_worksheets_middle_school.pdfIn PDF document text
    • http://mamawelujuke.rf.gd/tp-link_tl-wr841n_instrukcja_obsugi.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/teri_aankhon_ka_kajal_dj_song.pdfIn PDF document text
    • http://gozejozonamolub.rf.gd/patching_sheetrock_hole_in_ceiling.pdfIn PDF document text
    • http://wovikoverule.epizy.com/the_writer_presence_9th_edition_table_of_contents.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 5372 bytes
SHA-256: b9435d9c00ef07e3fee21d2bc0a575c66a56747a1bd42e6bad77530195ef5a47
font_01_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 10736 bytes
SHA-256: 85fcb9e66b8691ce2adfd7fe36a84e8a8cac8737c4c254c766b117b7cc80c6c5