Malicious PDF — malware analysis report

Static analysis result for SHA-256 763a9c9976d7d3ed…

MALICIOUS

PDF

82.8 KB Created: 2020-12-26 14:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a247cec6de36041edafd4c87e4aafe97 SHA-1: e977b77e341592a428f65a9199338d814589ad68 SHA-256: 763a9c9976d7d3edfb84a3291e39fe447cf6168c5f4d863af10372d2390821b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, with one prominent URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://trafffe.ru/aws?utm_term=manual+auriculares+bose+quietcomfort+35+ii PDF link annotation
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/dajelitosagik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5fe5fe7964053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fa1ea5bad178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5f984ef9decb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f9d131c2081e.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/jjheq88/water_slide_rentals_orlando_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/zpiboDT/sniper_elite_5_para_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fafa70fc82fd.pdfIn PDF document text
    • https://golosoruxo.weebly.com/uploads/1/3/4/3/134339442/df8128dfa188.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3dd7d55-8680-47d9-91aa-ec5e4185f7f0/40222475292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72adb14f-db65-4044-8fc0-276ebe953a9f/matlab_for_engineers_5th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539bc90f-b862-47e1-a4d4-e90167976cf4/que_es_el_ciguenal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb411519-8f20-4d8e-b987-db8918c008db/the_guardians_of_the_galaxy_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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 5584 bytes
SHA-256: fc95e06035f3094952f57e052c742487de98ca9186dee5c751e4ee4b6f02188f
font_01_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 2168 bytes
SHA-256: 224dfc1c4c166ba1dd370a93ff9e22fd9f28ee6fbbe7e759ed3b181a6ed8618c
font_02_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 11924 bytes
SHA-256: 37efb20c017305e8f7daeaeba362f5a7eac45be23295739b1c0c30335e5c89ea
font_03_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 12636 bytes
SHA-256: 854a79e65f6d7674b8aa71aca276616acfb99f01a48825a52d0203c690fc2970

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