Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76598ee9fdc08a1…

MALICIOUS

PDF

72.5 KB Created: 2020-12-30 19:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c91d47aac44c26e5aac35082dcd3322 SHA-1: 05bd9f3b37ea07065bfa00912bd742db2a94a653 SHA-256: a76598ee9fdc08a158955bd82f5e3a3cbad1f6ecd6e7c5da749791495fdcc764
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=tia%20mini%20stroke%20causes In PDF document text
    • https://cdn.sqhk.co/risubibasero/hhihaa1/11279602274.pdfIn PDF document text
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/lexuwej_wolesemokitunoz_jakunu_luvugubidumel.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/zggLahh/52425730904.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/eialot5/age_of_history_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/jbSHtjg/tamil_meme_creator_app_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b5a4bb4a-2eb6-4b4d-a9ee-96f7ca2ded24/nusegotun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bac2f74-37ff-4442-b35d-e98d8752f7fb/effective_phrases_for_performance_appraisals.pdf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76481f01-d4d3-4b04-b6c7-5ee04d3bce77/suwiputokagetaxijiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac7bfa5-1ef9-4e1c-835e-f3654ba20211/ozark_trail_quick_fill_air_pump_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e039a6d-7987-49c6-84c7-6a008cc907f7/levudotexugum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b9f013-e197-4dca-a8cd-097390486539/jaguvikazutijijaviju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83605067-b0e9-47ad-8e4d-dadc047cfecc/king_of_avalon_hack_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803692d9-abf9-4439-81b3-9091b7b73eae/28948694921.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_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 4808 bytes
SHA-256: 36225a35a36830682ccb4205bc13a19923fde8b27ff04090c301441b8477b7c4
font_01_sfnt_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 10268 bytes
SHA-256: 87c93c4c7db75efef6e6f7a706792609a81f2d53ce4eb6b1c22de2696afe3673
font_02_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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