Malicious PDF — malware analysis report

Static analysis result for SHA-256 263ca79774917876…

MALICIOUS

PDF

69.3 KB Created: 2021-03-14 10:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 29ef25c1bc07151dc44d7c33cd5542bb SHA-1: 449fa6213627f575c92d971458107c60f01ebbea SHA-256: 263ca7977491787629876616afeb2ac24f6de256461bb242d4a4c4c20c1c1eed
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/wix?keyword=florida+standards+ela+9-10 PDF link annotation
    • https://zitolibozix.weebly.com/uploads/1/3/4/0/134040523/tezawizup-vinum-zuzopa.pdfIn PDF document text
    • https://bemuvinuximu.weebly.com/uploads/1/3/4/6/134606549/dixineg.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/holistic_tarot_free.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/vilelumovanigidepe.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/peferu.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/d1860f4f4de.pdfIn PDF document text
    • https://kegebexik.weebly.com/uploads/1/3/4/5/134590944/7640165.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/pitejudubusowu.pdfIn PDF document text
    • https://bakefakibozig.weebly.com/uploads/1/3/4/6/134678469/9099859.pdfIn PDF document text
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/fokozuxusinefogefole.pdfIn PDF document text
    • https://fatofexar.weebly.com/uploads/1/3/4/6/134687548/tigotoxazafi_fifenitogenin.pdfIn PDF document text
    • https://pesilukijirizi.weebly.com/uploads/1/3/4/8/134864792/rasomomimifibij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegorabeg.atwebpages.com/fundamentals_of_legal_argumentation.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_b503c8fb153d4605b284105ab0d2ccd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/technical_feasibility_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/biosketch_template_nsf.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_79622d435f294710af1ef2cfcb04e5e8.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_0511b72fabaf4ffe92d614b7a56109d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/jetumubimexakakegot.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/xatolitumizibasi.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/capital_boitempo.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_24204cfe328c4002a2cbc05ef8b94721.pdf?index=trueIn 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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 5156 bytes
SHA-256: 6440ce55d1b24c0b10ab01434d4dcacb5942ee441e66c146be3f8cbb2ac3c698
font_01_sfnt_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 10160 bytes
SHA-256: f413e4c94c0b7371008e935840fff59de7d09931664ea6839a161d4a084213d7