Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b9ce93342571f…

MALICIOUS

PDF

49.9 KB Created: 2020-10-10 18:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eae7ee6528a619f2762405eb01e913cc SHA-1: d8ae517e49f31b679df9bd400cb8709200136811 SHA-256: 798b9ce93342571fd42ebde292ce2d58b73918a2db11ca14aa0977f8b087dccc
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically identified as a redirector to malicious infrastructure. The document body and embedded links suggest a lure related to 'Python programming zelle 3rd edition pdf', likely intended to drive traffic to malicious sites through SEO poisoning or phishing. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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/strik?keyword=python+programming+zelle+3rd+edition+pdf In PDF document text
    • https://site-1038982.mozfiles.com/files/1038982/punaxurojujuku.pdfIn PDF document text
    • https://site-1043037.mozfiles.com/files/1043037/53071104048.pdfIn PDF document text
    • https://site-1042867.mozfiles.com/files/1042867/demopotuvenatalaxemopurud.pdfIn PDF document text
    • https://site-1036635.mozfiles.com/files/1036635/34188780630.pdfIn PDF document text
    • http://files.bostonunitycup.com/uploads/1/3/2/6/132683135/3069448.pdfIn PDF document text
    • http://files.flowergirlnaturals.com/uploads/1/3/1/3/131383407/todijajabipel.pdfIn PDF document text
    • http://dasomex.wheteach.org/uploads/1/3/1/3/131380598/7775880.pdfIn PDF document text
    • http://wefeka.johnhamptonphoto.com/uploads/1/3/2/7/132710780/texigifenoke-vunedogakibevi-gugonepoz.pdfIn PDF document text
    • http://zososip.victorjoelortiz.com/uploads/1/3/1/4/131407005/9110185.pdfIn PDF document text
    • http://files.cbcfreeport.org/uploads/1/3/2/6/132696512/01be2973af.pdfIn PDF document text
    • http://files.freedomtoreadinc.org/uploads/1/3/0/7/130739684/2897879.pdfIn PDF document text
    • http://files.bishopkemperschool.org/uploads/1/3/0/7/130738984/bizumerokijikodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7324/0739/files/kamuzojojorawapam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4353/2185/files/ttr_90_manual_clutch_kit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6681/3337/files/allen_sports_bike_trailer_stroller.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00005e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8A 6408 bytes
SHA-256: b71bf7faf3a2ce2315c75c81a6c499eeb463499f5945c9b99d2f9af5b1770855
font_01_sfnt_off00006e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 5596 bytes
SHA-256: 41f7e18e87b6965196075648f0ef30b4b2489db3f8006065c84e73fdec40d986
font_02_sfnt_off0000813e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x813E 10128 bytes
SHA-256: 2d03246bfeec07dcfad6a58d20eb66e8db82b0e19d8f76d63879f220c75a0503
font_03_sfnt_off0000a41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA41C 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174