Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fffbb00aee8e019…

MALICIOUS

PDF

83.6 KB Created: 2021-03-19 07:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1748177b6ee6ec1fdf3a569e63555049 SHA-1: 4355888f677fc319ebe5e3975dadbc9c16230ec1 SHA-256: 5fffbb00aee8e01911d419d7d6e533c1662b35825acb88c7e60a7b92f0b35f48
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or link-farming scheme. It contains numerous external links, with one pointing to 'https://seumenha.ru/strik?utm_term=how+much+does+an+alpine+car+cost', suggesting a lure for users interested in car costs. The PDF's structure and link distribution are indicative of a link farm designed to drive traffic to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=how+much+does+an+alpine+car+cost PDF link annotation
    • http://fanutoragozogow.sportsontheweb.net/luwirowifamibulatasekun.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/amando_a_pablo_odiando_a_escobar_gratis.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/26876905531.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/1991087903.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/ms_excel_exercises_for_students.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/8316763945.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/47c1ab6a-512e-44ee-a34a-97b2d45c2af8/zigitutopubo.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_eee3036d29264a16a85fa590c9e7668b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d217180-2f5d-4a0d-8f31-6b879282a5d0/7016014875.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/macos_catalina_beta_not_available.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/22660191155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78a4f43-868f-4bee-9116-134c2c8bb710/93581443937.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/penuruwudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97fee83f-d2d0-4411-8537-e98ec28fb98e/why_wont_my_voicemail_work_iphone_8.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_c5ce88acc09842c796b5e3e0b752d9da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/19790477940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bc6c50-da45-4a99-a20b-ce5a5ecf2667/bajoxojumelateda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33838e9-d12f-4ac6-9e27-b8bcc6f9b8a5/the_secret_life_of_pets_characters_names_and_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f0bf48-6bbf-4be7-9279-720d9a71267d/podigimo.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/vobomesalepozu.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/monster_korean_movie_2014_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6d6db3-662b-42f5-8515-0018518809a6/schwinn_recumbent_bike_problems.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_90a44a2c4d1949cfbfcf58e2e886e47e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/sazobaxakenuxaritu.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_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 5248 bytes
SHA-256: 3e77fa84d355d079ed02e0932285922a2d8f206029adccfd1f530d9995a09606
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 10960 bytes
SHA-256: 8c59c6c408b5f716f139ff84a0d90e8262125ffd5e1d815613c724ba562eaf6d
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378