Malicious PDF — malware analysis report

Static analysis result for SHA-256 237ecbe20e701b14…

MALICIOUS

PDF

145.9 KB Created: 2021-03-16 19:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 14701703346c1ae6568ff5d9001cb50e SHA-1: d8c343d5556c80d0ac7aad639f3e6fe2d9011863 SHA-256: 237ecbe20e701b141b84f41c32a0a828781f1cc31920073b81d29eabbe808a5a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=cnn+10+february+4+2020+youtube PDF link annotation
    • https://cdn.sqhk.co/dumotometapo/iiGb9r1/21099176560.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/xelogopufitifexireto.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/bhiXNG7/the_south_picture.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/gihjujd/ranilobugedit.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/6969299.pdfIn PDF document text
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/6520011.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/jTpqgfs/pusarafurolazosusuzaje.pdfIn PDF document text
    • https://cdn.sqhk.co/jivobukafon/mo5Vogg/discounts_at_walmart_vision_center_morristown_tn.pdfIn PDF document text
    • https://bubebozozuj.weebly.com/uploads/1/3/1/8/131871643/taziranotari-rodozoj.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/40661971c7db9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vovokab.rf.gd/merchant_of_venice_summary_in_hindi_download.pdfIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_530304824dae4587a47d8121d56168c7.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_3e18cc19fa1a41f48d839632d26581f6.pdf?index=trueIn PDF document text
    • http://jofarizo.epizy.com/project_kickoff_meeting_ppt_template.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/60768204657.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/black_snake_dream_interpretation_islam.pdfIn PDF document text
    • http://penoputibilexo.rf.gd/42135709836.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/la_la_land_another_day_of_sun_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/wemefisuzanamoxilopalax.pdfIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_f8b051d016a14edfa953def3b7fe7401.pdf?index=trueIn 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_off0001f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F99B 5112 bytes
SHA-256: 04b520bd6200ebc6c6f908d4613ca705fe8e34629f031dae88153a70cf65b916
font_01_sfnt_off00020b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B20 15152 bytes
SHA-256: 8dec462b763830f6b1a10e0a5a7a797cacfc7b03049c40318b9fe1f4690bd8a6