Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f4a0d638d95ef0…

MALICIOUS

PDF

83.7 KB Created: 2021-05-13 16:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f777bdc7fa6ea2fe9835890279d4d8b SHA-1: db2c6d473d1a95d9b07302274808d366cac6c066 SHA-256: c6f4a0d638d95ef007b3a6ddda813eed346b041a6d3bdcd682cf11af32011586
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body's obfuscated nature and the presence of embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=super+shred+meal+plan PDF link annotation
    • http://kilewigi.iblogger.org/kobinijasizi.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/english_speaking_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/donewipimep/Yidgggh/oecd_report_2018_education.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/lilami.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/pCSic5l/neduvuwagilifal.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/who_were_the_first_christian_martyrs.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/KivjhgU/franchise_hockey_manager_6_download_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/896ebb60-1468-4be9-9c07-07510ed0e12c/why_pay_for_twitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf43d275-8027-4d15-9bac-0f641f724887/what_does_sub_specie_aeternitatis_meaning_in_latin.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/26950305304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3dec85e-3896-470f-94dc-040c3b4ab85f/59453520127.pdfIn PDF document text
    • http://risitikavaj.rf.gd/kujovewizatiwajuwobekel.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_3e42e82644ac42d5aadddf23fd98eeb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92078578-4bc3-4108-aba9-ffb5fabdcace/3032074744.pdfIn PDF document text
    • http://robumesexix.rf.gd/22873996848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39552369-80f6-4c15-acde-ffa530f1be6f/27374221215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653d8409-0c0b-481c-9032-0f45cf15602c/54950399958.pdfIn PDF document text
    • http://worutagoza.rf.gd/kavokadadonovosoromola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5204ab78-203b-42aa-ad5d-ad178f46d05a/72056155807.pdfIn PDF document text
    • https://c0add167-8731-41f0-9a7b-3d62f09b0499.filesusr.com/ugd/879476_ee3d7aa207804df4b666dc597fb0d441.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d1db5e-e1cc-4e05-be36-cfb6f16f986c/49666728322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162dded7-460a-47e3-a247-93d78bbb817b/22129999979.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 4948 bytes
SHA-256: 9b5c73bd4033063e6fbcdf6865ffb2cf6677906605d1aa010ddb8ac55154e71b
font_01_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 10884 bytes
SHA-256: 82ead216bd206e35b701df3c301e438e72d6873d6e84e14e8bfe8bb2a9f3ca0f
font_02_sfnt_off00013229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2