Malicious PDF — malware analysis report

Static analysis result for SHA-256 43822ab357f6ab15…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 12:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3af96401623523b45ba9d33b36f43a71 SHA-1: 225ed3eb52816efcd3f0fba5e28cca3c34517225 SHA-256: 43822ab357f6ab1538a677b1b3452119d450bff5baa2b5716e520b524cd6bb28
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate search results for various topics, including books and guides. The primary malicious URL, https://xezojetit.ru/wix?keyword=romeo+and+juliet+graphic+novel+no+fear+pdf, is identified as an SEO redirector, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=romeo+and+juliet+graphic+novel+no+fear+pdf PDF link annotation
    • http://gopilorujisuse.iblogger.org/badlapur_movie_free_300mb.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/winid.pdfIn PDF document text
    • http://kulokozataxat.22web.org/39219714204.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/fekesanoxukonib-xoden-baxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_601bde0865c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_6040dd43799ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_6008c0d9b5017.pdfIn PDF document text
    • https://jakigirizog.weebly.com/uploads/1/3/1/4/131453624/zujafipo-vonesan-nimezepa-lumelimobona.pdfIn PDF document text
    • http://buledumemo.iblogger.org/autodesk_cfd_user_guide.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/wevamakamavijufegori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_604640eae2570.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/jixeremipet/master_cleanse_lemonade_diet_book.pdfIn PDF document text
    • http://rexenejo.epizy.com/dhhs_guidelines_hiv_opportunistic_infections.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/california_ab_1432_mandated_reporter_training_answers.pdfIn PDF document text
    • http://kuwosuz.rf.gd/50151498800.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/75530905578.pdfIn PDF document text
    • http://zatozegajuzu.epizy.com/canon_80d_flash_in_manual_mode.pdfIn PDF document text
    • http://gitakatad.epizy.com/quotes_from_francis_schaeffer.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/apostrophe_for_possession_plural_worksheet.pdfIn PDF document text
    • http://vikarexazoz.rf.gd/88974064712.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/zojirushi_bread_machine_bbcc-x20.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/97494808381.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/to_be_a_slave_julius_lester.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/tennessee_vols_uniform_history.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_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 5536 bytes
SHA-256: 9ece1c415452d8d5459fc2a978ac1ef3a283319768994519ba7a3aadefa0fd4a
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10556 bytes
SHA-256: f030ba85347833e83b69fe9bf375455fed5c80aa82fd970f4087e0b8e8a19f6b