Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa1daaa06e82946…

MALICIOUS

PDF

79.8 KB Created: 2021-03-21 10:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 64995ba9fce5803afbd0bd0ef684ecf4 SHA-1: 21aeaab6993129a5b1de0ff6f7ed25a18f58813e SHA-256: 7aa1daaa06e829465a666093d84fbfa404aff2d669f2d5453e4d45ad5f7174eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further payloads or redirecting users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs are sufficient evidence of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=love+simon+the+emails+pdf PDF link annotation
    • http://fukuzowi.sportsontheweb.net/online_converter_video_to.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/acgfigD/algebra_1_chapter_5_quiz_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/haiaiih/neon_snake_print_alexander_mcqueen.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/41915176536.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/ecjhKT5/csr_classics_gold_glitch.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/VlFVhfY/free_music_download_for_android_youtube.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/c3b3eb2a7728a.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/9206154.pdfIn PDF document text
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/4499654.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/12185532396.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/iibheVK/this_land_is_your_land_my_morning_jacket.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_b87c85e0eb9a4d2b8057ae1419c93888.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_a8159b4337e042c7b3ea6872e4399ed7.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_dd441d44fe6b4123a95c81b9ba0030d3.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_e4cc8ef7cd2346ca8f41668859905ce7.pdf?index=trueIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/what_does_ethical_hacker_mean.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_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 5184 bytes
SHA-256: 097771faff30768f805590cc88a4354326426f18ee20f7d8e947d17c342c6537
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 13084 bytes
SHA-256: 1c9f31489557d09af2269bfa35ccb28febe5f96f205455a44c95a72913d7b281

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