Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd066039c768fc11…

MALICIOUS

PDF

78.4 KB Created: 2021-02-20 10:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5dad95d1dff54451af904911a2ea2ed6 SHA-1: 6023cdb617115c1296b08ac805105e09a2177597 SHA-256: dd066039c768fc11cf0c0cabfa8659c875c3825307de73fde979c22d02187656
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The document body, though heavily obfuscated, appears to contain search-related keywords, suggesting a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=black+clover+asta+full+demon+form+episode PDF link annotation
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/4898334.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/Z9jcLic/calendar_2020-_21_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_5fd627d12a86a.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/7396c9f9ec4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fc69be0a897e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_601b00533931b.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/ggeShgZ/bufetiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fceea572c3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_600fc56d1506d.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/a3da232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412763/normal_5feccc8a4a826.pdfIn PDF document text
    • https://pegufalijedosok.weebly.com/uploads/1/3/4/5/134589263/7656677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_5fd90eac0c7a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fc861f10e700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letituxis.epizy.com/goruzawasikejogilujas.pdfIn PDF document text
    • http://zaniwemikadas.rf.gd/sikuxora.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/gojinojonojotupagibiloz.pdfIn PDF document text
    • http://sovizaz.epizy.com/79652850702.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/dezejutenejorilepimip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 3636 bytes
SHA-256: e06f27a5be3a955b66bf55bf1e326118a279b8ea83bf337727b3c0720262ffd1
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 5472 bytes
SHA-256: 64064d41340ee0888157744e7a7b8367195fdb49863f4505966e7676c9212c03
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 10472 bytes
SHA-256: 9d220483820e6f4c22ab82657dcb4d8f4d59e7abc50b794bf17a9a1f8be5aeeb

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