Malicious PDF — malware analysis report

Static analysis result for SHA-256 64988b512f6216bd…

MALICIOUS

PDF

86.3 KB Created: 2021-03-20 09:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 50798737f499fbaee4d418f1e150fba1 SHA-1: 296c36947ba89cdb519269f30bb928d1bd80926f SHA-256: 64988b512f6216bdf6f5f639a0ef5c1972acd85b47ef84531a3f43484eb46579
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, suggests a link farm designed to redirect users to malicious sites. The ClamAV detection name 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+much+water+goes+in+dr+brown%2527s+electric+sterilizer PDF link annotation
    • http://study-english-05.site/24712405138o4wrk.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/bTzpNbX/59799720452.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/hiKsibj/nesujovaxiwuzuwanipapubog.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/terufesix.pdfIn PDF document text
    • http://autokenn.com/22149098684drd1o.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/qic8jd2/kalemud.pdfIn PDF document text
    • http://leafester.online/225834786565f1k8.pdfIn PDF document text
    • http://prosale.company/weretibakonoa5q68.pdfIn PDF document text
    • http://posiriwase.22web.org/766448192.pdfIn PDF document text
    • http://reduslim-officialsite.site/teradek_cube_255cc7gg.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/iiaiinf/download_offline_soccer_manager_games.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/JRdj2ij/3078157709.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/bahibij/417037004.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/hivd3ja/fagabusitizufewu.pdfIn PDF document text
    • http://fomoregekamikat.mypressonline.com/mapamundi_con_nombres_y_division_politica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e872d1e8-dec4-4569-b222-b1bcf50a7d6d/great_synonyms_formal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7902bb96-4909-407e-a887-30b2d41b2585/giwofobogugimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6eb198-325a-4877-a6b6-8961e552f3c4/biochemistry_book_berg.pdfIn PDF document text
    • http://zukalovuno.rf.gd/catan_guide.pdfIn PDF document text
    • http://polexusuzoxofiw.epizy.com/40652957481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b87d059-ad71-46cf-aed5-476ccf57ccd9/73008448779.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/11329244443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7dc4923-7881-4f32-8cd5-4d79cd34edfe/troy_bilt_tb575ec_carburetor_diagram.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_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 5628 bytes
SHA-256: 71d0c4d12a039f446ba39575f61c8fedad386c239397ce8f51649bce228bfea9
font_01_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 11128 bytes
SHA-256: 81fe56f9870d19dfc2153307e4c90382838e0bae8844118a5c68d9825198d1de

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