Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a06b2c2c365d4b…

MALICIOUS

PDF

87.3 KB Created: 2021-04-02 05:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f0ccea2b7bd50810ea261860f8438bbc SHA-1: 2b7a860fc30aec26aa4ae06e98ce4b2733456dc4 SHA-256: a9a06b2c2c365d4bc27182c4e5c8ed6ceab279e409f6e8b04a1fc91e340d204a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to SEO redirectors and potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' highlights a lure using an image to redirect to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=gary+vaynerchuk+wine PDF link annotation
    • http://xirijapip.mypressonline.com/18269947475.pdfIn PDF document text
    • http://vadanunagirira.getenjoyment.net/kpss_tarih_pratik_bilgiler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365536/normal_5fdf548a4e8f4.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/bldc_generator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5fda1a24e0276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_603b5770e2b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fe7e8257aadf.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/atmasakshatkar_ka_vigyan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soranodabiwegi.myartsonline.com/notice_agenda_and_minutes_of_meeting.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/71196967704.pdfIn PDF document text
    • http://rakixufemagotut.atwebpages.com/anthropology_books_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/66484136343.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/33239314344.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_603269fa65ae459297549e25d2b6bd32.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_43de4dc345694d9daa4053d84dca9dc9.pdf?index=trueIn PDF document text
    • http://zimopup.myartsonline.com/38017499966.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/1581355716.pdfIn PDF document text
    • http://wetukanezin.atwebpages.com/roratisalavixo.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/datomazodudipak.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_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 5028 bytes
SHA-256: 67b296894239607841e2825e4ae3be9d54853681895e771d1e8a9c0a879bd25d
font_01_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 14840 bytes
SHA-256: 280ee4b38c4bab30dc8c89e2b0a720e7aa0959f50c16187f8a890b2e7ba44ba3

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