Malicious PDF — malware analysis report

Static analysis result for SHA-256 726476728346b973…

MALICIOUS

PDF

120.6 KB Created: 2021-03-24 23:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73b698eeab671247f8b075e36eddf104 SHA-1: 7ea9ed02881a17b2504de83f58f4cc635f518627 SHA-256: 726476728346b9736792dabd8a15e35b05756a68c3f709f8f677859c7eb742d2
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 domains and potentially malicious content, as indicated by the ClamAV detection and ML classifier. The embedded URLs suggest an attempt to redirect users to phishing or malware hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+is+n+in+the+nato+phonetic+alphabet PDF link annotation
    • http://x-bionic.shop/matulifurw1p7s.pdfIn PDF document text
    • http://begdas.fun/71414003874zhxqe.pdfIn PDF document text
    • http://lumacy.site/95594168102gk2yz.pdfIn PDF document text
    • http://boost-shop.xyz/49509407595yjkax.pdfIn PDF document text
    • http://fuckfrsky.com/neriganisinejegapotaaq9mc.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/99986608431.pdfIn PDF document text
    • http://pmaider.com/1562234381223gt2.pdfIn PDF document text
    • http://detonic-hypertonie.website/bbc_planet_earth_2_worksheetsaxjxq.pdfIn PDF document text
    • http://melofuwi.getenjoyment.net/lejemigugiruwekisej.pdfIn PDF document text
    • http://autoupgrade.website/23920861370q75rk.pdfIn PDF document text
    • http://vuvuga.xyz/fuganasd2qw.pdfIn PDF document text
    • http://besefobusim.mypressonline.com/45139141274.pdfIn PDF document text
    • http://tuimag.ru/how_to_install_dryer_stacking_kit1jsnv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_b3cca59f3568457e930dd7ee98e2878b.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_3d1d289e1c97406e92b341c4272d818b.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_4956a7318d7d4b598fa09d7ef345edc8.pdf?index=trueIn PDF document text
    • http://wutesejib.onlinewebshop.net/1997_polaris_xplorer_400_carb_settings.pdfIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_4cb4fdfb446c4335805c87321ebeef89.pdf?index=trueIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_3c368c1951b841a993982fbb599e4a16.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_8a13679863d24353ac799b45ac1ee95a.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_599005e4b1e749a1b6bf343ba0e87777.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_0a9a949634d94c50b7d21a58248bef05.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D6D 5076 bytes
SHA-256: b6aab5a30b6d606413cbea6ce3ad6b8ce55092a35a9c72535d42411975619281
font_01_sfnt_off00018eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EBA 15796 bytes
SHA-256: 633abadb7de665db9a7b32ff66a5051541b88e5625c5a28cb074e35af085411c
font_02_sfnt_off0001bec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEC6 16116 bytes
SHA-256: fbdc905918934bb14f99f3f16c6e87e7bf0db5b1ec9dce6803c569451e9c8458