Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03b75405bec10d6…

MALICIOUS

PDF

70.3 KB Created: 2021-05-31 19:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 409bcae3419834b97395fa610730cd16 SHA-1: e376d83fcc40243f47e4a59e9e916dcfd81514f7 SHA-256: c03b75405bec10d64303516af676229fd2d396317063948a0832ff14bdf66cc9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical detection for a link farm and a high ML score for maliciousness. It contains numerous external URIs, with one pointing to 'ketchas.ru', suggesting a phishing or malicious redirection attempt. The presence of embedded URLs and the PDF structure indicate an attempt to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/pbw?utm_term=although+despite+in+spite+of+paraphrasing+pdf
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/6596e7c950f6.pdf
    • https://giwedogifuj.weebly.com/uploads/1/3/4/7/134741463/donomez-kutekinovimaf.pdf
    • https://static.s123-cdn-static.com/uploads/4401545/normal_5fdd612c007ae.pdf
    • https://cdn-cms.f-static.net/uploads/4373992/normal_603f510f05d97.pdf
    • https://sapurokegija.weebly.com/uploads/1/3/4/5/134577933/masopitigisi.pdf
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5fc65776a595d.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_6029c82365acf.pdf
    • https://zugavalomiseba.weebly.com/uploads/1/3/6/0/136082075/a4bb9df.pdf
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/vezolineweluwakozuj.pdf
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/1742747.pdf
    • https://zipibolusoxa.weebly.com/uploads/1/3/4/6/134627603/gazirizikese.pdf
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/9587874.pdf
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/4798683.pdf
    • https://cdn-cms.f-static.net/uploads/4387219/normal_603505757fdcb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ee40155e-d1c8-4d07-9124-851961b91c6a/dojixasakigasi.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144411312/difojomuj.pdf
    • https://uploads.strikinglycdn.com/files/a06210aa-8bf1-4e33-9df2-086f9a10fa6c/fojomubozivesodezam.pdf
    • https://uploads.strikinglycdn.com/files/385a09bb-916c-4e2f-9b89-ddcd0362436d/79955803295.pdf
    • https://uploads.strikinglycdn.com/files/399a9c2e-71ae-47bb-b281-9a64c359dfd6/33575146769.pdf
    • https://uploads.strikinglycdn.com/files/f1f865e4-034e-499e-ab39-649888396a5e/95344964225.pdf
    • https://uploads.strikinglycdn.com/files/12484d2b-3ba0-4806-9c9b-30c575534e36/78881306992.pdf
    • https://uploads.strikinglycdn.com/files/bb1e1542-8d89-449e-8617-16d6e7704b33/commonly_confused_words_practice.pdf
    • http://lijegazoz.pbworks.com/w/file/fetch/144416097/vida_y_muerte_en_la_mara_salvatrucha_characters.pdf
    • https://uploads.strikinglycdn.com/files/6b598eec-f275-4827-a0c7-185034f5a9d5/83579800444.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67c.bin
af4224cbc361bf830669a3b41878a53dcd2e12b5b396df11c22cd2c1e2146db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 5292 bytes
font_01_sfnt_off0000e876.bin
23c7fa47ce102dcdb356d417885030ebd966f2b4a965daa8032a224e7337060f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10336 bytes

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