Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaf6815b0b1fc68…

MALICIOUS

PDF

67.3 KB Created: 2020-12-17 22:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2a3047a86b64e35df3974993534cb690 SHA-1: 3152ab0637edbee3e642ffebfd4cb91864e7526f SHA-256: cdaf6815b0b1fc68b81a661bdff2f5b3a012f7f5f2f61763dfbe63d3057575be
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm for SEO purposes. One of these links, 'https://traffmen.ru/123?utm_term=ladybug+painted+rock+images', is known to redirect to malicious infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a phishing or redirection tool.

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 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.
  • 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://traffmen.ru/123?utm_term=ladybug+painted+rock+images In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fb67d0f1c65e.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/32c78c847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_5fad497762507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5fced152bdcad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc368199955c744b54b807d/t/5fcbcaa136758319a55c6373/1607191202235/57526942577.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2de16085bf90c0e0a0dd7/t/5fd05b0f51357b44bb8f1abb/1607490325862/81363130810.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/kamuzazabegasuxogi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc16b11c6229360ecb0a135/t/5fc66d1b1972c46e3c7b5499/1606839581426/td_spend_app_review.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ec6c8787e879896c16ae/t/5fc16853fa04221c7154b56e/1606510676975/61512171544.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68d526b97992eb5827da1/t/5fc856f090a4f8549d756687/1606964979238/52114094535.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/pesinixuvininexevevaz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc383e42cf09257bd7c65aa/t/5fc5f2a64e98326c02de5dfe/1606808230924/stadley_rough_school.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28400a5bc066edfafdea4/t/5fd0ad96a946005758837e93/1607511447185/72027863789.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_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 5608 bytes
SHA-256: e3a484272e04108928ddae5256810b70039f0a58f91b82753e09d4f5d4d5cf85
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 10812 bytes
SHA-256: 31757cf1dd0940f0fef2c20b115448bcd06647f4117c036fcd71ade1306b48a4

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