Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc5ef3cfbc83108…

MALICIOUS

PDF

68.8 KB Created: 2021-02-24 22:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9529695482edca5699e3f56775253373 SHA-1: 961ac7fcecd009f18c1e7f4ca55fc76ba6aa4333 SHA-256: fbc5ef3cfbc83108101b9c9196653fbaff23841a5d3a371bfbda6b6dea1ad163
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. ClamAV and ML classifiers strongly indicate maliciousness, specifically identifying it as a phishing trojan. The embedded links, such as 'https://maypoin.ru/wix?keyword=inscribed+angles+practice+worksheet', suggest a lure to a malicious website. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users.

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
  • 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.
  • 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://maypoin.ru/wix?keyword=inscribed+angles+practice+worksheet PDF link annotation
    • https://cdn.sqhk.co/foseziwate/hbbnhci/happy_street_store.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/ejhVdgf/winimozepifevibidonupe.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/ghfHfVB/luminocity_festival_new_york.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fee3b6a74f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_5fd386bd3eb2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_601a3bdf5bda6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_601cdc85e6a3c.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/2303039.pdfIn PDF document text
    • https://mifopezuzata.weebly.com/uploads/1/3/4/4/134484464/5430637.pdfIn PDF document text
    • https://maverutorolo.weebly.com/uploads/1/3/5/3/135393183/lanedarebaxugove.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/xalasawu/22820818847.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/tazefofobabovejikova.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/dauntless_fps_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/cardiff_sixth_form_college_school_fees.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/vonegezukezigerofarenefe.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/kerofilimilizuzadux.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/jijoleworesawugojujenazap.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/65292521520.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/conjunctions_worksheet_for_grade_2.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_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 5568 bytes
SHA-256: 76278ebf8165dca25966e66a4338029575d4b7dc71b6b35c34c9e9fa5d8a0bee
font_01_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 10128 bytes
SHA-256: 559d4fd97772b578670afb423142133cad586bc29f7a52f15d32808e7b36a989

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