Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffce4cd08ea0499…

MALICIOUS

PDF

82.3 KB Created: 2021-02-18 02:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 859185d3cc5a7fef65aa5266ad5dbed2 SHA-1: 93274a255e04a5c7fe71af5a17068800977c3a7d SHA-256: 4ffce4cd08ea049973b07826c9236a04467e6536401435c989992f19335ebdf5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary external link points to 'https://bologen.ru/strik?utm_term=python+machine+learning+best+book+quora', suggesting a phishing or SEO manipulation tactic. The presence of ClamAV detection and ML classification further supports its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=python+machine+learning+best+book+quora PDF link annotation
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/cffb5d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_6012173967a0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_600134c734214.pdfIn PDF document text
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/tulotasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_601ae0fcce2c1.pdfIn PDF document text
    • https://tupedofezelazib.weebly.com/uploads/1/3/4/3/134368784/824193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5fc94c0267367.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/diborojeribu.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/5900591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodigejo.rf.gd/53118676209.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/83644954033.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/disifuxaraterexokuso.pdfIn PDF document text
    • http://kimises.rf.gd/2895591286.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/96883653885.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/luxury_bed_sheets_nz.pdfIn PDF document text
    • http://botetuvixomidiz.epizy.com/75909410119.pdfIn PDF document text
    • http://mowadavukusut.epizy.com/lepomotinirojikaf.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/free_handout_templates_for_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bapagejesumadepalogi.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/62689088860.pdfIn PDF document text
    • http://tukudapig.epizy.com/57140925247.pdfIn PDF document text
    • http://tijilidimipep.epizy.com/79163860867.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_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 5648 bytes
SHA-256: 339be4d4b9b2a3ff6ef142ebfb3ccbc7f1400dd95f006e05611e67895e5b414b
font_01_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 11640 bytes
SHA-256: 9fca2864d27390c6ddaa5d4e1d231c4aefd27c9a14efb88c18eb2084b8d4c490

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