Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1855ecac8a508f…

MALICIOUS

PDF

102.8 KB Created: 2021-04-10 22:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e4315d71ef4c4192d3e02fbd14ab5bc6 SHA-1: c5231e4bd148182344c22f47f8c49db4081baad4 SHA-256: 9e1855ecac8a508f2f983b05d83da779dfbdfd6925fad9ea672016b11a02f751
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or link farm operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware-hosting sites. The embedded URLs and the document's structure point towards an attempt to manipulate search engine rankings or trick users into visiting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=how+do+you+fix+code+34+on+a+carrier+furnace PDF link annotation
    • https://pamimimafe.weebly.com/uploads/1/3/0/7/130775080/benozovifipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fd10bb139d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5fd6a29e52f5d.pdfIn PDF document text
    • https://supimoxu.weebly.com/uploads/1/3/5/3/135319300/vosonitele_xaginiw_sidipanufop.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/bebujasujusafuvi.pdfIn PDF document text
    • https://gulekizusivo.weebly.com/uploads/1/3/5/3/135392766/vijukol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5ffc625b71c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_6048dbf77f0f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_60117c405fda3.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/88992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gawusozuf.epizy.com/android_mobile_codes.pdfIn PDF document text
    • http://pinezininefos.epizy.com/batman_begins_movie_in_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6761c19-c0b7-41bf-85f9-f660e26feb0d/washing_machine_cleaning_service_kl.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_c23c85708af241a6bc1a0a49a311e875.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_47b9a9f954a04ff0a5f0d15fa84a5908.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_1a552bd99a0d4848ab1b7c9a2879fdf3.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_28395665c59741b88a1c54930ea42f7d.pdf?index=trueIn PDF document text
    • http://vodevuparebe.epizy.com/caged_system_for_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46df4a22-1ffe-4470-9321-d490bef40703/kowarejevexugijunaf.pdfIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_673989143eaf4f0b890733c39c58347c.pdf?index=trueIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_2e3dd4aa1c3048c483959a44c0122529.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_e42309695dd64364a352863280b39ef7.pdf?index=trueIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_f2ba56d8cd5341c1aa2ba40cc0bebf8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9d18d4-e13e-466e-9262-82ea244c3af4/38791857347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d963ba-b531-4f28-84c6-38bb027e325b/cuisinart_electric_juicer_-_black_cje-500.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_off0001509d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509D 5280 bytes
SHA-256: 23fcc1a13c3667f6de02cdaaffd8219cfcb315f2176656284cd60be7e85e66f8
font_01_sfnt_off000162c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C7 11972 bytes
SHA-256: eeef3b0ae86178fac542cea6ee6a29ca3645b42f421983a599e7ed43b653aca9