Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3df9baeb2209f59…

MALICIOUS

PDF

67.9 KB Created: 2020-11-17 11:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 974d068c80e7f47a6442e0530c487958 SHA-1: d4cb5ecbc8aa909afd03ece4d1211e83aae98482 SHA-256: f3df9baeb2209f59c3a1909e10b7707d040872521e6f298cea6ac20ba09646d9
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to a 'Sustainability report 2019 samsung', suggesting a lure to disguise the malicious links. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point to a phishing or malware 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 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://traffine.ru/aws?utm_term=sustainability+report+2019+samsung In PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_5fafbe4762e78.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/suwuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5f99eba74b3d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5f98fe4520fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f9ad2f9e77d8.pdfIn PDF document text
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/zetagabufurowosikelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5f9156514044e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f8e05e6caca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f98d3e8d2871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f89000425095.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/befevifa/words_with_auto_root_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92eb8d96-2d6c-4d13-825f-e44eb7005ab4/xelorotenefurosadiz.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/manualidades_para_nios_dia_de_muertos.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_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 5964 bytes
SHA-256: 735520c1d369f1671d75fd930c68662ece0012ba90736ad062e6ca74f17c854a
font_01_sfnt_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 10592 bytes
SHA-256: 0f55fdb92c56b0df30e89958e153402ffacf4648fd5a09c84c6e3ae1dcff74a1

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