Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e8c513fd2d6ba2…

MALICIOUS

PDF

95.9 KB Created: 2021-03-28 09:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e6e1aa7c46587b6c14c9b0507430f19b SHA-1: 99d60183f1a3d0e466f6f69ab098e30cb2b7ca87 SHA-256: 28e8c513fd2d6ba217d0714d981f3b1e34f1ee9a3f9b10d177d477ef3b44f2ec
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=silicon+valley+companies+list+pdf PDF link annotation
    • http://canlisohbetim.net/84881214273o8uzt.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/427710688661e36i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_603d3a99c5258.pdfIn PDF document text
    • http://blacktea.space/how_do_i_connect_my_logitech_wireless_keyboard_without_a_unifying_receiveribt5j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_60217f1493cb5.pdfIn PDF document text
    • http://topcabinets.xyz/what_is_the_correct_order_of_operations_in_algebra_mathematicssuy7h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_600bfcdf69b17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459055/normal_5fff33e224f09.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/EheMshj/guided_meditation_script.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_600a8bec35682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_6038fea25203d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_603c6a90254cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412763/normal_5fd0852560b04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_e3f71cfbc5f94211a0489038c361c01f.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_fae0f93d76cb4880b37476ef94a3b5e8.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_8f2655c86aef4282b96d635b107acae5.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_71b92a2435c04062a955592855011c33.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_4d7b64d4ab294bb2bd709f6fe79a824d.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_8dbcd2f325fb4b758d2521bcf163efab.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_6bd91bfba20a43caabe76b1decf4cbb6.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_f1e82ecfe247464d8baa6c7f1e1acfc6.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_e2c088914169432d81d74d358de4d4cf.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 5472 bytes
SHA-256: b2047c5e0d502e63bdc2f95f7e5acd3f0b6bcd36f82594f2013c58de72977d0b
font_01_sfnt_off000149f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F8 11904 bytes
SHA-256: a2d16ec2caa962623debb4608f06af8f51b5f62bf6a1f636a4783b767eb442b9