Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d3493c5c3fe72b…

MALICIOUS

PDF

64.1 KB Created: 2021-01-03 23:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 29a478f2cd875939c1bbfab016736d9b SHA-1: eddaf224729ced190b3600f3fad3dfa13b371797 SHA-256: 89d3493c5c3fe72b57874ac48a7af87cfbdcfb466ce525f9752adec03823e2df
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to a known malicious redirector. The ML classifier and ClamAV also flagged the file as malicious. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://traffmen.ru/aws?utm_term=private+pilot+flight+review+study+guide In PDF document text
    • https://mirivibi.weebly.com/uploads/1/3/4/2/134234555/8830962.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/zesixefe/saeco_aroma_espresso_machine_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/nemonexoxuzamerojujunizu.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/19270585866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f8ff62-49e5-4967-843c-ea9d2c39d23f/dalovigug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7df270-d777-400b-a7b7-5a6ce7665be6/liquidos_miscibles_e_inmiscibles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a16345-8746-4d42-aca3-84c7bab06236/jajofaxuzewames.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/pufokuravikibivarasusokip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fcb2d8-3137-4d98-a531-148561c64bfb/womens_role_and_importance_in_the_french_revolution_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7943cbcd-f866-43ff-9960-48af3e2d50d7/martin_logan_lx16_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e82031-a630-48fb-8d1a-97e5e13f37c8/how_to_get_chatterbox_division_2_reddit.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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 5560 bytes
SHA-256: 47b5ddc19da0f7114a46765920f53e47da69f8333fc8b106a4e1b8ff3fca2761
font_01_sfnt_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 10084 bytes
SHA-256: 57d12fd73ffc93a67dd22424e2f1b988b6513ffdd95255d5141725f72687929b

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