Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaa6034bfafd8f7…

MALICIOUS

PDF

75.1 KB Created: 2021-04-03 00:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6e3a8936010178ff8449540bf03ed835 SHA-1: bbaaddda9f6b501912788d646e36ad53510ed635 SHA-256: bcaa6034bfafd8f7a9e2dfa28b61ebdd113bb99cc88c1b0666b38d10c5ef9fda
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, a common tactic for SEO manipulation or distributing malicious content. Heuristics indicate the PDF links to known malicious redirector infrastructure and is flagged by ML classifiers and ClamAV as malicious phishing or a trojan. No scripts were extracted, but the overall structure suggests a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=academic+writing+practice+for+ielts+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_6017323e554dc.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/bangla_book_class_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_60108f8dc4f9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe4365acf47b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_605e089bf2696.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/7671990.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/dental_radiography_principles_and_techniques_5th_edition.pdfIn PDF document text
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/9669885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369777/normal_5fe2d0fb18f2e.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/91354003260.pdfIn PDF document text
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/kevuruxofubejok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_604b4efabbe56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_5fc7acb1899c3.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/taller_autoestima_para_nios.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/zurigusiwatek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donijexufenu.onlinewebshop.net/bartkowski_chirurgia.pdfIn PDF document text
    • http://visugog.myartsonline.com/pugovite.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/kovedeki.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/ccc_plus_exam_paper.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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5556 bytes
SHA-256: 354896e15432616eec2da0ac8f6e6c028ff3842dcba44284fc723164ecf8452b
font_01_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 10724 bytes
SHA-256: 488c5ca1e185f984f100c7cc060e42921f2e1a22bb149dd8f34687f1a49d1dfa

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