Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a737018a51700de…

MALICIOUS

PDF

80.1 KB Created: 2021-05-09 19:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de6be80490c19b20c63b9f70334db062 SHA-1: 3034727e247f776c8ffabecf55583d91b5fda721 SHA-256: 9a737018a51700de10b1f6388b832d47f144fa0d7b24feb502afa5d53cd303cd
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which are hosted on disposable domains or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a scam. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=will+ge+universal+remote+work+with+roku In PDF document text
    • http://noxesim.iblogger.org/irs_business_travel_expense_guidelines.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/22317979412.pdfIn PDF document text
    • http://tarageleg.iblogger.org/weight_of_sole_f80_treadmill.pdfIn PDF document text
    • http://strahuemsya.info/wikud4qa5l.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/nopodi.pdfIn PDF document text
    • http://accueilcmb.com/vudatnpxcs.pdfIn PDF document text
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/6770850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polotukumi.rf.gd/65423826637.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/boxing_bodyweight_workout.pdfIn PDF document text
    • http://vawirir.atwebpages.com/dotudujowega.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_6a59c84ed58547d49f07198d37401e0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/10067923458.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_19f72285d04143ae8122cfa104cc88b4.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_96512e98fd6a48ba9a85ee6bd727407d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/is_it_a_good_time_to_buy_junk_bonds.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_384e24634dd7411f93f2bf5bcb8e53d8.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_4820ec8c74414510b351d313364965da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/24662003226.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_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 5328 bytes
SHA-256: 5b8a0b23840abd1bc14a533b84deb81aa83ad661b45c402f72d0315656c1a226
font_01_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 11116 bytes
SHA-256: 350c49fae74d5aa3180921b3ca81b40bfac4e37e550b86de44f9875b119182b6

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