Malicious PDF — malware analysis report

Static analysis result for SHA-256 23991c4e751726bc…

MALICIOUS

PDF

83.1 KB Created: 2021-05-24 17:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 71f384cadc2cf92247b074d36130e90e SHA-1: 245712724ccbc7c6e05bf5df02f444ecb0f02dbd SHA-256: 23991c4e751726bc9467814016cc87752aef72e427d576b4f27fa91451db48e7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=areas+y+perimetros+de+figuras+geometricas+ejercicios+resueltos+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5fcc392d01342.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/1821889.pdfIn PDF document text
    • https://tenojamerefu.weebly.com/uploads/1/3/1/8/131857247/36ab493aa29e80.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/goxigunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_601ab4f1e5891.pdfIn PDF document text
    • https://dovilukimiju.weebly.com/uploads/1/3/0/7/130776072/mepopokot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_6033bde0485fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_606bfdd78c46f.pdfIn PDF document text
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/ziwudutevimawas-buvobigejazot-tisabo-litegakaku.pdfIn PDF document text
    • https://xemewewekakefo.weebly.com/uploads/1/3/5/4/135401485/mupenagowirolo_josimesalup_zobawerig_padedamiborejoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5fd282c1b6d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_60691e3edb819.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zupenafud/buseb.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/lipil.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/how_point_of_view_affect_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/45719578520.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/how_to_learn_r_programming_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/dezizuzore.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/how_do_you_find_someones_address_in_australia.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_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 2616 bytes
SHA-256: 7910548c98589b8bc69fce473a6fdbadf48768e40c3ccd562965fc23bbc5fb50
font_01_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 5644 bytes
SHA-256: 7f951b6dc50781f4c5ee3959a4a3a2a0c0e9eff8f6385fdb6d740717f32b08e8
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 12580 bytes
SHA-256: 0b176b1fc567f37e61f1ece7b4ff61b13fb7468815397a13c5ca93c4ad624cc4

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