Malicious PDF — malware analysis report

Static analysis result for SHA-256 481e1897c24f2792…

MALICIOUS

PDF

40.7 KB Created: 2020-11-07 02:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b0cc36a7799fbff3120dcae8afa378f5 SHA-1: dd8bb5f33c1ca3850262758cfaa3147a225c939e SHA-256: 481e1897c24f2792f757ca5d3575ea7ef7dc211fcdf7e478717d298aa947f5bc
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafftec.ru/aws?keyword=opioid+conversion+calculator+mme PDF link annotation
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/kigok_ziwanijurowid_mukevide.pdfIn PDF document text
    • https://vifedunujaxali.weebly.com/uploads/1/3/4/3/134398483/a321c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5f96e3842f171.pdfIn PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/88403.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/8da2135.pdfIn PDF document text
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/novuniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5f9e89e70cba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f8d62cb78f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5fa5de9fed48d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befarekogol/infrastructure_engineering_and_management_grigg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eec56cd-a37b-4218-a6e0-4203144c7cdd/15212777074.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_off00005b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B08 5304 bytes
SHA-256: 90bcc3d942059a18caf93f338cde0d8371663b477a9cc9b73a11b1dbfc4a99fe
font_01_sfnt_off00006d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D02 11684 bytes
SHA-256: 8220b08cccb37753e44c7c0fd81b2853631195ad97c5bb7b1429c411fdff01c7

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