Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ade7ed8da5f64a…

MALICIOUS

PDF

110.1 KB Created: 2021-05-02 07:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 76672425a7b68ba12dc77b0a3e67f7d5 SHA-1: 03b25ffd621dfaa6470d8b660d4636ac9586ff8c SHA-256: 99ade7ed8da5f64afe513070ba07f03b10493da93d2c2140f9d080ba1d4017ae
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to further malicious content or phishing pages, serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=my+life+and+work+henry+ford+wikipedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444098/normal_6034110d2c913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fe01a60c6f38.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/5025882.pdfIn PDF document text
    • https://vijivavepedu.weebly.com/uploads/1/3/4/3/134313627/judaluraregad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_6031c2777db2f.pdfIn PDF document text
    • https://gopilabuvimira.weebly.com/uploads/1/3/1/4/131453416/1510154.pdfIn PDF document text
    • http://depalowivejal.iblogger.org/arrian_anabasis_of_alexander.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/c029b.pdfIn PDF document text
    • https://ginozupil.weebly.com/uploads/1/3/1/4/131411281/wizotuzomedofudule.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/rubeniv-namaxixaw-fofisefokuw-lubemap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_603190bdd08f6.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/dc0f0a4ab.pdfIn PDF document text
    • https://pekesasopalono.weebly.com/uploads/1/3/4/5/134505129/sovejude.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/xexokezimut-majumugoxugu-wodaluno-megatub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabunuwo.epizy.com/38132824109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce5bef1-f38d-4efb-9db3-80ac88fdb3db/how_things_work_simon_and_schuster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5b1ee5-d3c2-472f-8629-5411442c5520/vimor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d271e17b-e5e8-4bc7-aee9-c6fa01e5482d/12732452924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dba5c2f-2eb7-4473-8fbf-86beb6ba02b1/how_many_volumes_in_attack_on_titan_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b750b4-c609-4157-8f84-42298c01f9c4/5928139906.pdfIn PDF document text
    • http://fujalur.epizy.com/gramtica_de_ingls_para_brasileiros_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b42001-ad61-49d9-97cb-24955d0089aa/the_queen_of_attolia_read_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c86742e-f7d9-4b22-a83f-226378265a68/45834787991.pdfIn PDF document text
    • http://nufewusuk.rf.gd/83151452875.pdfIn PDF document text
    • http://sanubexudo.rf.gd/nesetak.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_off0001626b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626B 5216 bytes
SHA-256: bdda77fad914e90e5dca1eeea6b893f7c94afe8070b2b64eb687c4f8751e2dd3
font_01_sfnt_off00017444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17444 24968 bytes
SHA-256: 4621e543df640b7694923971794eed699e40c36027346ea5739675c6b2678e08