Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d1b3d4fd21c9f7…

MALICIOUS

PDF

74.4 KB Created: 2020-11-10 12:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f2e862d859609b6464b8670c60d5d716 SHA-1: 1190554aa9294673004c9c87ca5273484237271d SHA-256: 55d1b3d4fd21c9f789ee0cc94f54050c73d0625163d8d27945bc151d855fa892
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of a malicious URL suggests the document is designed to lead the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://cctraff.ru/aws?keyword=quotes+about+freedom+in+huck+finn In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f998a09ac07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f913c2ac6bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_5f9e75008fd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5f9336e2538cf.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/17498cb0-e021-4cde-92ce-121cb57ce883/13761623374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6151bc4-9c15-4078-a04d-0ff09704322b/ooga_chaka_ooga_chaka.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/62422777256.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/dd_rapier_and_dagger.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/caida_libre_fisica.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/mosadetegabewawofibutu.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/hungry_shark_apk_downloads_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8507f9a4-076f-4949-89a5-0b4fd17f8efc/gexejowutivuvaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/wide_grip_bench_press_t_nation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e24e25-57b0-49eb-87a4-ccfdb839ae84/tufuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4951967-7eae-4d13-8484-a39deb17db13/13803893140.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/slam_dunk_2020_highlights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c3b38a-f39b-4661-a882-0b57fa4c48e6/goririvebasugozalodejupo.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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 5496 bytes
SHA-256: b556eaa7c342a120c812d8444c59277646fd5b0f483e9dc376192125e05ef44c
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 10664 bytes
SHA-256: 73139ebce3fee42437cb33f6484807be0de79c0e0e4aa7b6cfa13b4fc35ae4c0

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