Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30084cc34f21588…

MALICIOUS

PDF

82.1 KB Created: 2021-05-19 18:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 52b60c6bef7c029b589c466f304a8b49 SHA-1: 67ce8566dd7f3601c25b1c1188ad660f8c5aaa71 SHA-256: b30084cc34f21588ef40be15e13afd89413f1515f8c1e84142596917fb42cedf
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to accessing Tor on Chromebooks, directing users to a suspicious URL. Heuristics indicate it's a phishing attempt and a link farm, with ML classification strongly suggesting maliciousness. ClamAV also detected it as a phishing trojan. The document body, though partially corrupted, contains elements related to the lure and the authoring application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/strik?utm_term=how+to+access+tor+on+chromebook PDF link annotation
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/ligogim.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/cb34b704965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_603870dd99b56.pdfIn PDF document text
    • https://pemanawawe.weebly.com/uploads/1/3/5/3/135320082/medupafexatag.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/temib.pdfIn PDF document text
    • https://jivikusobule.weebly.com/uploads/1/3/5/3/135326696/fc0bcafb8e063f6.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/388070.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/maxegoponefe.pdfIn PDF document text
    • https://nepejudakolop.weebly.com/uploads/1/3/4/8/134876169/27983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_6065b6c0a287b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_606e7cee2baf7.pdfIn PDF document text
    • https://tumulole.weebly.com/uploads/1/3/6/0/136054957/c1ffe21d3aa.pdfIn PDF document text
    • https://kovepezerolozu.weebly.com/uploads/1/3/1/4/131483153/2892554.pdfIn PDF document text
    • https://newogevalofa.weebly.com/uploads/1/3/4/8/134898908/lozadejorexija.pdfIn PDF document text
    • https://kikosubulu.weebly.com/uploads/1/3/4/8/134884397/1fd71ca39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/simujix/free_html_templates_with_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/mavegawevizuvevezem.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/lofapofiweriselewarer.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/arial_pro_black_italic_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/69085062195.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/81071075994.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/alien_shooter_hack_android_1.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_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 5004 bytes
SHA-256: ee0ab95b57a68ab6b3e0069044f1eea643ed5ca5d475d4370168c0bfa0c936ca
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 10596 bytes
SHA-256: d58618d318645efe63b8abe1920903c36b7b0c5d62123225ccafa575f1a8e77e
font_02_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3