Malicious PDF — malware analysis report

Static analysis result for SHA-256 a855d6bb6d4ceacf…

MALICIOUS

PDF

82.1 KB Created: 2021-03-15 10:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0660bcbd5cb672620c1bda4bfa80aba4 SHA-1: b05eb4b73199c2ffc87377a4c848d10dbbfbafb3 SHA-256: a855d6bb6d4ceacfc5431f2764e325758f0b1de1b483f6f02dc6b3c2cdd740e7
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm for SEO manipulation or to host malicious content. The presence of a 'download button' lure and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The ML classifier also flagged this PDF with a high probability of being malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=beer%2527s+law+lab+report+answers PDF link annotation
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/6854332.pdfIn PDF document text
    • http://instapriz.site/403313756487jy7o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371003/normal_5ff77297509e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_602c03fd71a7a.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/8100300.pdfIn PDF document text
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/paridelutofoti-wazumu.pdfIn PDF document text
    • https://gajarasanen.weebly.com/uploads/1/3/4/7/134714971/3309559.pdfIn PDF document text
    • http://tvoy-ogorod.online/3_phase_transformer_current_calculation_formulal5aoj.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/wiwamoxamo/giwimojoguvufo.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/18456866177.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_8070c21901014935845723211319a11e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kevava/37192804315.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_fc3b64843a7a43948cbca765d1cc8c2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/21650431799.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/haier_hlp21n_how_to_use.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_44066e1568fb4093a3bf0ff8ae82e418.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/god_amman_image.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_c4750fd764d044eea7ed5e2afe8d7513.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 4868 bytes
SHA-256: d551ed9095ec2c7c5e930e80d62aa744d9dd969697454ab3130eec93012ce1d3
font_01_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 11096 bytes
SHA-256: 5c7650a1efa0edc3f627fabade912e1cbee9dd16a5803e5e04d2349a50a092cf
font_02_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 16108 bytes
SHA-256: 2906e013a2c12f8438753706de5a20d0a45d34478d649377d82f29cc76ae0543
font_03_sfnt_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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