Malicious PDF — malware analysis report

Static analysis result for SHA-256 90daede6c70a417e…

MALICIOUS

PDF

83.8 KB Created: 2021-03-07 10:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fe60f15f92ef058b53cbe0d684cade29 SHA-1: b33e92c0a04ede026a91616c670586a5030f9970 SHA-256: 90daede6c70a417eeb92902511324638ef932bcef5e305d1fc50c159977d0779
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/award?keyword=ciclo+de+krebs+rap+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366660/normal_602a87a7e68af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6014d1ea62c1a.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/ximivuwaxesexokanus.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/jupujuza.pdfIn PDF document text
    • http://stroymarketmetal.ru/what_is_the_biblical_significance_of_the_number_4444fojtm.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/585501.pdfIn PDF document text
    • http://worldhold.online/how_to_write_greek_letter_chi_in_latexisf0i.pdfIn PDF document text
    • https://sobomevoza.weebly.com/uploads/1/3/0/7/130739746/9966411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455639/normal_5ffdf8d93a255.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/what_are_job_titles_in_retail.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/how_much_is_the_new_ccna_exam.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://s3.amazonaws.com/kukazowox/how_to_factory_reset_kyocera_duraforce_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/i_found_the_treasure_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/eclipse_ubuntu_32_bit.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_685ef230ada2463289963c305f57d16d.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_97a8d8cad9424f2da1c35d4660fc4c2e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 5212 bytes
SHA-256: d23ab4db42bb9593022ee036fed724ff0698c94c4f6c70a508738dbb5bfea8f8
font_01_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 1800 bytes
SHA-256: 03028bfdcff919b04ef39f813e673763b680bedf515ecddcaca022b2ee037edd
font_02_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10856 bytes
SHA-256: f6932de42db22c024a35b013c4e9470df41d323156e8d2269b481be132c2fc2d
font_03_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 16136 bytes
SHA-256: a6a78e247d77a84da3a8c500ac16c4d965d7f7a227a0c1d9193ac79acc0c2e62
font_04_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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