Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5b9eab1b29e305…

MALICIOUS

PDF

80.6 KB Created: 2021-04-16 06:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5018401d768a8907932db801e70b1201 SHA-1: a5b034be732d542ba62dba22df0165402af2c173 SHA-256: 7f5b9eab1b29e305c68a9436c43d8f8b119d3134e2a24073632e9d2ec99fa4b2
156 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 of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL suggests a phishing or scam attempt by using a search query as a lure. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=gimpy+meaning+urban+dictionary PDF link annotation
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/xamefovume_pelizodepas.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/stevens_320_field_slug_barrel.pdfIn PDF document text
    • https://kukavijeri.weebly.com/uploads/1/3/3/9/133997324/bepigotubamiti-gulixunu.pdfIn PDF document text
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/8384624.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/kuvuzorinup.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/explique_como_acontece_o_ciclo_de_krebs.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/wovunofererusokugojerukap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebabub.rf.gd/ammadi_ammadi_full_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/zufojajigudumemexa.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/how_to_lose_weight_while_breastfeeding_diet.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_a279a1e1992447c18b4c8d4961139456.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/lekudosa.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/zuliwikosajuz.pdfIn PDF document text
    • http://nufularo.epizy.com/how_to_be_the_best_pr.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/nozomelavuxutozeg.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/89697500476.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_fd472184a5d6499d9a6440ed41f03228.pdf?index=trueIn PDF document text
    • http://lufevexos.atwebpages.com/65030899711.pdfIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_3b68a8686f4d4579b05573d47faf35dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kabisebax/xawapofezonirilokirufene.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/60980888440.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_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 5456 bytes
SHA-256: 79cf7ee0c76715094d1ac09cad9cfb49a370c81b80793bd60c5c62bab35a9e4d
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 11304 bytes
SHA-256: 9b1571d66db3872a6b67432d2e9346238fe47b2e1f8d6f72fafa3f2c38aa6570

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