Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e34eeed89c0852…

MALICIOUS

PDF

74.0 KB Created: 2020-11-19 03:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a476d0b4e805f300b1fb30fac3319329 SHA-1: 20b931ea74bfc3b4664f9ae2a07ac75adf6c5f0f SHA-256: a7e34eeed89c08524528c43b547146ea621b4bb4d6dcc240d3f79e5c0f423e0b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various URLs. One of these URLs, 'https://traffset.ru/strik?utm_term=how+to+cure+mini+wife+syndrome', is flagged as unknown reputation and is likely part of a malicious link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/strik?utm_term=how+to+cure+mini+wife+syndrome PDF link annotation
    • https://defonufagij.weebly.com/uploads/1/3/4/3/134360363/tosorutone_jejijob.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db68e919-e858-4e1f-ab2a-378b528810ae/62262771514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce6d5dc-1a60-44a7-93cd-47640140e118/sigma_1009_bike_computer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/clearance_form_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666c223b-336a-40a2-af24-c5a85c970609/46516081882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b6032c-1f6c-489e-bf10-6835a8cfe125/tezopiwigavoxizowunolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1e8cc9-38db-43df-8102-6bcfc4d354f5/zakosotisuwugib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e8f212-bef7-443f-87e5-f855094a4bd2/palizaba.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/helen_geake_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00cb710-c671-4e62-9616-30a0ab7ba967/starships_of_the_galaxy.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_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 5080 bytes
SHA-256: 11a9060a9130c0c3f770de1ac6a33fc3faf36c740f4c0ecd57a785d26d15fc79
font_01_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 10732 bytes
SHA-256: e7e35435b4eafacc3fc819061683e5ccaba87afe95cad7340a0eb4a8933c2764
font_02_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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