Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e07b966b0b11e26…

MALICIOUS

PDF

86.6 KB Created: 2021-02-15 03:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3a9bff9397ccc60da7c4023b53b56051 SHA-1: 84409bd423c281694e1e09967ba0523502329394 SHA-256: 8e07b966b0b11e26f046b00c567cf2ac7e80cc1fff58e046c9f6e54a8ee64623
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'chhota bheem cartoon' and 'wkhtmltopdf', indicating a lure to attract clicks to the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=chhota%20bheem%20cartoon PDF link annotation
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/8095574.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/0ca00e5b9752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fe4fcec79b24.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/baruxunulo_fudenutifezigo.pdfIn PDF document text
    • http://kidepokapila.22web.org/wisugiwidesubudibuka.pdfIn PDF document text
    • https://zunukewonodej.weebly.com/uploads/1/3/1/4/131453615/tiwuwarasix_marajuwigogopi.pdfIn PDF document text
    • http://powerpoint4you.ru/star_wars_lego_snowspeeder_instructions7zxtd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601ab77d32e98.pdfIn PDF document text
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/9715492.pdfIn PDF document text
    • http://itprod.space/tipewifipavuravumexinuxu2wz.pdfIn PDF document text
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/mabenotuwigubiropi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379048/normal_5fd047ccef243.pdfIn PDF document text
    • http://geesecam.com/61335959197olrt4.pdfIn PDF document text
    • http://erkutungotu.com/xalibodulufodilabimodefwzvn.pdfIn PDF document text
    • http://lumacy.site/49171436007r5mhd.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/5985112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piperopire.rf.gd/32492174279.pdfIn PDF document text
    • http://nagukubuliduz.rf.gd/56872812638.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 4872 bytes
SHA-256: 520f90f2c21f7e83f1e6a24d89fa18dc011f9e67c02e3374db98187df7b0b5a9
font_01_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 10764 bytes
SHA-256: ad88f78fc6b3d73c945fe6c3b548403ecf347ef010a32dbd923a3eae14a13b23
font_02_sfnt_off000137db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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