Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c0f6b02f22d062…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 08:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 94f0a764915ca42f64f2bbd21d632e96 SHA-1: 19f41c22d61d9de9d5fb05791fa778ecb0e168b0 SHA-256: 83c0f6b02f22d0621710a79f07b16819ea0d48795838747de43d6a6d2fbcf31e
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, suggesting a link farm designed to drive traffic to potentially malicious content. The document body, though heavily obfuscated, contains keywords related to legal acts, likely a lure to encourage users to click the embedded links. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs points to a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=benami+transactions+prohibition+amendment+act+2020+pdf PDF link annotation
    • https://nilorajokurede.weebly.com/uploads/1/3/4/6/134626806/4183099.pdfIn PDF document text
    • https://xebigami.weebly.com/uploads/1/3/4/6/134661154/muwivipuxefi.pdfIn PDF document text
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/7461876.pdfIn PDF document text
    • http://jerigegunodew.iblogger.org/73010388880.pdfIn PDF document text
    • https://xuleminemixek.weebly.com/uploads/1/3/5/3/135333740/26133.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/4912632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_60333a14d757e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_601254a4208cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453528/normal_603e571724aa9.pdfIn PDF document text
    • http://ruseseru.iblogger.org/xamaruwepog.pdfIn PDF document text
    • https://fixewanum.weebly.com/uploads/1/3/5/3/135309042/govumumenemeneje.pdfIn PDF document text
    • https://mevepabazeme.weebly.com/uploads/1/3/4/0/134013418/zifaxikalojubuwas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusogit.rf.gd/remington_700_sps_tactical_308_accessories.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_da0b229d5eff4d7bb80e8bc76e8c7b4e.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_f768896551134036b53e8e36ddaa8261.pdf?index=trueIn PDF document text
    • http://jixizawunireda.epizy.com/55225958007.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_d4fdb711f1c14ea098c24646a938ab91.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_14666ca8e56d42a7bbe3e07d48fb2d37.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_ef5fec402b8e4c15aa7fd760709b7b7d.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_46211224be634d4fa48ebe13f0230fa2.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_4e5dc0071d2d44d7a7d6aabb512fc4b2.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_78fcfbcf3f2e4f7abc7d87d2b0c8cb35.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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 5828 bytes
SHA-256: 87e961fb4e276b6d7909db642303ab60a2d1e42cda291018aede56dcb096ad1f
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 10468 bytes
SHA-256: 268d873101e49674358ecf4bf5e46c14a30ac390af46535505345e027228c609