Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc2d267e712fce8…

MALICIOUS

PDF

93.8 KB Created: 2021-05-28 01:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0675b936e8d53afb8b793dd2de8454b5 SHA-1: e3821b6d6d5ac9f5519dbc17337bf6144b6f8230 SHA-256: 7dc2d267e712fce86398cf3eeba3b698d5e879c3312565ee76987c41f4e3b6d8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://golowaki.ru/wb?keyword=realtek%20high%20definition%20audio%20driver%20windows%207%20macbook%20pro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365636/normal_60253812a813f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_6018ecda68245.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/db7babf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408709/normal_60aff075b5ea8.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/rujakitawuvukox-samagiz.pdfIn PDF document text
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/1675573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_602d462aa41a4.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/jumajojokap-durudumuz-romomizafis.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/b401e362ea5e4be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fc7e4aa8e4b9.pdfIn PDF document text
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/3a600472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fe8e4dd1bab6.pdfIn PDF document text
    • https://xunatopek.weebly.com/uploads/1/3/2/7/132710497/motigavil.pdfIn PDF document text
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/5ed367ed60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_603ab0d94c1fc.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/18a0cbb.pdfIn PDF document text
    • https://pixovifovefesuv.weebly.com/uploads/1/3/4/6/134626719/4161529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5ffb5a4c267dc.pdfIn PDF document text
    • https://tekulumadon.weebly.com/uploads/1/3/4/7/134767252/diropuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fec85a6554ab.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/670ed3cb-b614-4c77-9c68-3e6abbf844d1/lets_talk_in_english_conversation_101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196bd878-9ada-40ce-a8f3-b835d2cdbc1b/44479899983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4c471a-c257-4d2a-a85f-95c25cfada4c/how_to_structure_a_tok_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac7e61b-3b33-453b-aaa4-6efafa5983e4/36391005431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254e5480-ed89-442c-80ff-c2edec12a241/ap_language_and_composition_argument_essay_outline.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 5892 bytes
SHA-256: cd0f247a4a23f4de151d99f67505ba8d1e7b26197cdd016499f1ac28e87e50e9
font_01_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 10988 bytes
SHA-256: d9af779852f91ded4005f38daed16d5ffbccedae4fb874d5d16d6d2c48e091f1
font_02_sfnt_off00014559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14559 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off000159f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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