Malicious PDF — malware analysis report

Static analysis result for SHA-256 72262c42f1ad4d44…

MALICIOUS

PDF

77.5 KB Created: 2021-05-30 06:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a21d000587a7bf89ff0e44b5a7a4dc7d SHA-1: 237d87460dd10729dd196a94c5c8299fc7ba9315 SHA-256: 72262c42f1ad4d44223801b55ec74cfec9c635b9dc9c897ba358f78545ce8af6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or directing users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one prominent example being 'https://xerirexu.weebly.com/uploads/1/3/4/5/134592073/783088.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit users.

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://resalured.ru/strik?utm_term=sportcraft+tx300+treadmill+for+sale PDF link annotation
    • https://xerirexu.weebly.com/uploads/1/3/4/5/134592073/783088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_606c23bebaa82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_604df4c4cc886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458404/normal_5fef93d74de27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_606de69670cef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_5fd0eec7d0c83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393041/normal_5ff9cf3923dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_605a4f585a47d.pdfIn PDF document text
    • https://kenuvibugitevam.weebly.com/uploads/1/3/4/7/134700053/cd2d0530afd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_60530c1e9e99a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367951/normal_6001b73e1ab39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_601978d4a9057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408197/normal_60048b7ba4c4e.pdfIn PDF document text
    • https://foniliwis.weebly.com/uploads/1/3/2/6/132695455/jikizuzajuperes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421335/normal_5fe38179999a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_6016f7352ae65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5fe47e2c91e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_602f0b5fa8072.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/4b7e130d-6526-4517-ab7b-106e1b5a37ee/can_i_add_carplay_to_uconnect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369b42ac-c22a-4786-8ae6-cf9da671cd68/67913869233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e16e5f0-4617-492c-b0c0-456faec5db3e/how_do_you_write_an_introduction_letter_to_a_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140ad859-9a18-4cab-aa9a-7abc988dc34f/which_sentence_is_an_example_of_a_metaphor_brainly.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_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 5780 bytes
SHA-256: d321b79f869725581ef931a6ff408d4acef2ddf653539d94f92488b2e5684718
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10476 bytes
SHA-256: 4b20a0520eb202156ae26f9ec567e9edd678b3ecda55c1cab50be7c76d6dc86b

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