Malicious PDF — malware analysis report

Static analysis result for SHA-256 e169ccf64a90d0f7…

MALICIOUS

PDF

79.6 KB Created: 2021-02-14 14:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2dec5f5d0f0370abb4680df853ba1aa4 SHA-1: 7701cdd2443541a99c5ebdae8fc5803c800ece0d SHA-256: e169ccf64a90d0f741c056056b1b070d291f9bd5589143df478ce0c4ef2d1d91
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to SEO-optimized PDF files hosted on S3 buckets or other domains. One heuristic specifically flags this as a 'PDF_SEO_LINK_FARM'. The embedded URLs suggest an attempt to drive traffic to various websites, potentially for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and heuristics indicate malicious intent.

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://bologen.ru/wb?keyword=arterial%20waveform%20ultrasound PDF link annotation
    • http://buyervannakupitvsem.xyz/677486457050ivha.pdfIn PDF document text
    • http://afracheat4.xyz/vupobucz2y.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/sapukigokonok_noroxoboraweg_fijozusajona.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/dtThdge/bubble_shooter_game_aarp.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/riremeromijis.pdfIn PDF document text
    • http://thrivewebs.com/formatos_publicidad_facebook_2018ef5ld.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/beluvevekowoza_gijizi_vajafegufimiv.pdfIn PDF document text
    • https://lolekujawifom.weebly.com/uploads/1/3/1/0/131070351/nogizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lukepepe/zupovosituvejeviniru.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/nacionalismo_economico.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/26915116052.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/artificial_intelligence_mit.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/bodoniflf_roman_font.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/clothes_worksheets_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/cara_bobol_wifi_zte_via_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/norowojagem.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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 5192 bytes
SHA-256: d483b8c3be25fdec4c6619dff2d34f9401216f40c9049f35ad293a6ab3cc518e
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 11672 bytes
SHA-256: 3e2286e636a7dd95913a1917ae530a7f4ea14e3c8fa11ffda966170ffb1063e9

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