Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a61cc50f81e493e…

MALICIOUS

PDF

63.6 KB Created: 2021-01-16 22:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f5d144782dac7b91f0c4149733bfd179 SHA-1: 07ff96ec98d056cc99d86b149c924cba10be9745 SHA-256: 9a61cc50f81e493e7de43b85313eebbc59179ae02872d2c7e1d715b6c1ea4750
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to drive traffic to external, potentially 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
  • 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.
  • 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://traffine.ru/123?utm_term=mybackup+pro+apk+download In PDF document text
    • https://site-1174086.mozfiles.com/files/1174086/donkey_kong_64_arcade_game_cheat.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/2576839.pdfIn PDF document text
    • https://kimulidorifuvup.weebly.com/uploads/1/3/4/8/134856260/9226624.pdfIn PDF document text
    • https://site-1175290.mozfiles.com/files/1175290/34007285044.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/3252459.pdfIn PDF document text
    • https://vujerige.weebly.com/uploads/1/3/4/4/134467486/bepufevumizukaboj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/36008039161.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/91746632870.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/glass_tile_backsplash_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/93929420192.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/galvanic_cell_experiment_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/mugebigebusetupolivo.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/wekoso.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/55807610529.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_off0000bde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE8 5292 bytes
SHA-256: 83201162d8d63b7f6c1e76860567819ad3057bacc26a517ba0201f7cc4d7203b
font_01_sfnt_off0000d01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01A 9880 bytes
SHA-256: 32d4e80d5b683260dece9494cbf6e3f8b7242c70fd95cd0df4afd010e00dbde6

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