Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6f86eeafe70a96…

MALICIOUS

PDF

69.8 KB Created: 2021-01-06 02:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2cff76f01ae2e8b87fd7e5b08ae449db SHA-1: 7048a5b2513f829327ee77415352ba477bc04fa5 SHA-256: 6d6f86eeafe70a96f2145b06abceb975fa833a79fbf121685f7452beb21e98cb
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or SEO-based malicious campaign. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious URLs.

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://ggtraff.ru/aws?utm_term=poliform+yard+coffee+table In PDF document text
    • https://static.s123-cdn-static.com/uploads/4371808/normal_5fdd8572131f3.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/hgejgFV/gun_master_game_download.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/lisekiretonokur.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/m1uhbgg/artillerists_mod_apk_1._1._12.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/jiifH2V/happy_jump_phone_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/hcgijfW/domediwus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_5f9f2ca0c9e2b.pdfIn PDF document text
    • https://cdn.sqhk.co/wiberini/jighJy6/uncharted_2_fortune_hunter_edition_ebay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5ff45e4ed05da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e436b3-9389-40a9-b147-a9a5f055d410/65019612435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8863cd-6040-4d97-98e1-48c47de98e9c/lead_in_tupperware_measuring_cups.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0158f049-ecaa-4ef1-8d59-d3728bfde2e0/29549460908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4485248c-ddfd-46e6-9b3c-83e4c2090bde/descargar_csi_las_vegas_temporadas_completas_espaol_latino.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_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 3056 bytes
SHA-256: 517f08f538c25c473876c5625776d6519d372826bf51222d0a5540f06811a6c7
font_01_sfnt_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 5232 bytes
SHA-256: 138d11492819ae07377da8bb605abe4acd5eb338c2e051eb76fdcb9a4d76cb4b
font_02_sfnt_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 10368 bytes
SHA-256: 9e037d045f2d2195b3f59fd5f932790c5e93669109ba8cef1c70cad46ec73863

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