Malicious PDF — malware analysis report

Static analysis result for SHA-256 519f0ebcb59024bc…

MALICIOUS

PDF

66.6 KB Created: 2021-01-14 05:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 11c59c4c016d3f45b8e6e19ffc258631 SHA-1: 76ba987c74f1c2c9a48c969320eda5d71c1743c8 SHA-256: 519f0ebcb59024bca629fee081cd59341e0215ff98a87a139f987f69440994e2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, and it contains multiple links to external resources. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://traffking.ru/aws?utm_term=weather+report+india+map'. Another critical heuristic flags it as a PDF link farm, containing numerous links to other PDFs, suggesting a campaign to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/aws?utm_term=weather+report+india+map In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5fa1c0c5e0148.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/5513116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367286/normal_5ffec4a7ce5f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/yemen_civil_war_map_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/prism_video_file_converter_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/in_the_afterlight_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/exercices_corrigs_atomistique_s1.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/78703502394.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/maternity_dresses_formal_plus_size.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/business_brochure_template_publisher.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/sap_bpc_segment_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/2019_census_application_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/facebook_lite_apk_for_tizen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 5004 bytes
SHA-256: fa7e3393124e158bc17ae08bb09a2ac2bda3109e0bf802a2d65231100eabd579
font_01_sfnt_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 10544 bytes
SHA-256: 40bf9b21fe57cc05f788da303150ce16100dd7e0ce3610416af97c597e63e1ef
font_02_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 2736 bytes
SHA-256: d821b1b99decae0a63e0e297223ef46f53de90ed031ee28129f5cc3de1f16202

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