Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be86a7d9bf77ce1…

MALICIOUS

PDF

73.8 KB Created: 2021-03-08 08:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 773d5a1050c89728689815c37b267ed7 SHA-1: 89911c1c34174f4c7dacfb801bd50139e5992ad5 SHA-256: 7be86a7d9bf77ce1774ca67819b47cf136dbebb48aba01981fb8bc4b7b4762d2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the primary URLs, 'https://leonvi.ru/wix?keyword=roblox+bricksmith+badge', appears to be a lure to attract users searching for specific game-related terms.

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://leonvi.ru/wix?keyword=roblox+bricksmith+badge PDF link annotation
    • http://srakan.space/how_do_i_get_my_hdmi_to_work_on_my_toshiba_tv4oflb.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/7876123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5ff1bb62de8e1.pdfIn PDF document text
    • https://bofubesal.weebly.com/uploads/1/3/5/9/135958810/5112140.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/wamalan-kaguxabuf.pdfIn PDF document text
    • https://remanajuzox.weebly.com/uploads/1/3/1/4/131437778/pifewob_nupizizu_zoxenuxalazeg_labenadozetami.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/1111dde15b8645d.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/botimem.pdfIn PDF document text
    • https://ratewanevunexem.weebly.com/uploads/1/3/2/6/132681210/muvedit-mewumoxuzop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_601e607b4badd.pdfIn PDF document text
    • http://dektesheff.xyz/vuwanalonojonuxotokerimazo9dw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5ffcd4d687a12.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/jemanidoregal-xawevusalidu-jubiwurenokuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6034541cb4e1d.pdfIn PDF document text
    • http://ygrash.website/venosuzasigaxikvfhhk.pdfIn PDF document text
    • http://iciapp.xyz/36643155726edqie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_602974bdce98b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_4b7b9117b5c74f8086990095a4f9a8e5.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_99bde911ddf24277b3431d5e53c2b0c3.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_5b6eca2067e642b28a34b39408a65d01.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_e66fe711b2fd4f85b39dd2a656390e8d.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_e3030e05b9704141acf234c9b595d038.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 5632 bytes
SHA-256: 4f1c75913664e0e355678bcdb2f64e0c0b27469ae454b97b24daa2638d4135ee
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 10060 bytes
SHA-256: 82597e3a6a11f78cd434e83f4bec32fb48303895b2228fcdfb09bdad06191281