Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28225089bba830c…

MALICIOUS

PDF

77.3 KB Created: 2020-12-17 09:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 09aecc87e8091d8e01044600149cbfeb SHA-1: 280e8978e2c0ece33432b80d74aaf4b04731c205 SHA-256: f28225089bba830cb268a64de093147e44ec89ede4eee8ffba6f5072791a0753
254 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDFs, many of which are hosted on Weebly and appear to be part of a link farm. One of the primary links directs to a known malicious redirector. The document also attempts to lure the user with a "remote-support tool" pretext, suggesting an attempt to trick the user into installing further malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ggtraff.ru/123?utm_term=gopro+session+5+owners+manual In PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/litodedowi-jerufurirari-delukab.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/aac5e1581c.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/e9cd1168bb.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/1709446.pdfIn PDF document text
    • https://mopimigasu.weebly.com/uploads/1/3/4/8/134858917/peluvipazazofe.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/4594211.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/ee30060a055e.pdfIn PDF document text
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/49127c66f515b.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/6c1051e728835f2.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/6092296.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/fagejal_sobig_guzubofifu.pdfIn PDF document text
    • https://luriwopowilexat.weebly.com/uploads/1/3/4/3/134338936/vefaxewalotusole.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/jedijigov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc10f47bd14ff0dd29d9327/t/5fc6a68fe18c5c478ee5ea68/1606854287313/63865899399.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf1a8e6d49a06bb5652f5/1606283689430/suijin_no_hanayome.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce0b02c83faa584acdbba3/t/5fd6bd4dc4373837b9190f27/1607908686733/lisavafurule.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68006ab79f442f250112e/t/5fd6ac62267c8d0ace529bab/1607904354664/firewetebovusu.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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 5212 bytes
SHA-256: 9517adb429daca3c5e612f43cb5616e09a7588676e61bfbf9ab707d801100f11
font_01_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 11036 bytes
SHA-256: ab12d2f67b57391a0fa97d0c7b29fddcc9d49f9f547c3ba62eb1089bc576777a

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