Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47c3c8afaf3dab9…

MALICIOUS

PDF

78.6 KB Created: 2021-06-03 12:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7ad1cb6e50561b5570dcfef76da12f89 SHA-1: 50777b8a3f336766a2f6b77badf515c39e23faa0 SHA-256: c47c3c8afaf3dab93e746e2310a3227aacacc37b7041a1e4e0d62b3ceb3f8a7a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://archism.ru/pbw?utm_term=present+tense+simple+and+continuous+exercises+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4456728/normal_60b70dabe206b.pdfIn PDF document text
    • https://sutisivanopazar.weebly.com/uploads/1/3/4/3/134310164/5d7c31cdea1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff06209f0ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_60419ec0139b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_603c335c4d867.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/08c97650580c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_60599b6ad29b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_604d0b841f2e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_60513274d890d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421042/normal_5fd81f37e8ec8.pdfIn PDF document text
    • https://zulujiporanaru.weebly.com/uploads/1/3/4/5/134590758/e4bd7ef0850db.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403557/normal_60afffe0bb6fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_6021ffd1b5fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_60390a009d6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_6033b1789c5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_6026101fa0f34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwomodanom.pbworks.com/f/fetamewedomoxijonefadete.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144415314/6320488248.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/f/soxulalovifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9985d886-44b5-44c5-8a94-53137f357e9f/2312227564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e060199-5c1a-4664-b5d7-079f19eb6ed3/english_translation_of_the_holy_quran_by_abdullah_yusuf_ali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58510588-261e-466f-be03-32e515bb6234/44240582582.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_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 5372 bytes
SHA-256: 8c7659cfcb072d96c75986de084293ec11a799410e4d007c08000a3b6b5c1c16
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 11068 bytes
SHA-256: 04f94ca18ee1b1a89d1325d9b90b59aad45ea8e3684e9cfbdab93da663619c22

Open this report in the interactive analyzer, or submit your own file for analysis.