Malicious PDF — malware analysis report

Static analysis result for SHA-256 af87e9cdda397227…

MALICIOUS

PDF

65.1 KB Created: 2020-11-18 13:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d3a1515300f14a97cce7675310e815ac SHA-1: fe576c4eb52a97105c03b881ee3ae95414089b8c SHA-256: af87e9cdda3972273d8d1e6b9c4253467db9f3b4d1d4a02b244b0233496fea56
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with the primary suspicious URL being 'https://traffset.ru/strik?utm_term=entrepreneurship+successfully+launch'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it may have been generated programmatically to appear as a legitimate document. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=entrepreneurship+successfully+launch PDF link annotation
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/ba9145702af3d.pdfIn PDF document text
    • https://zuxaminuxux.weebly.com/uploads/1/3/4/6/134652083/kegozekiwuro-jizegelufus-kijiludagin.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/jirasemogivepu_pewiwodar.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/rojadigijofepav.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/widiku/81317913597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f971978-5f62-4ada-9abf-54b67e27c535/96458580028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19c86ac-82fc-443b-9996-9f6a5c9b98a4/98313105092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ff1075-6850-471f-b4a6-3195806aee30/kinif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599e1ca3-162e-4e6d-9779-43a5ead7fe5a/13th_warrior_full_movie_download_in_dual_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/tipepitajatedeju.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/fejigivovebumojudage.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/introduction_to_axiomatic_set_theory_takeuti.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF17 4932 bytes
SHA-256: 2917b9245fd05e3fea827e09b4bf9bacdaf28e065d7a802fa4be561cbbe9765f
font_01_sfnt_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 11224 bytes
SHA-256: ed749bbe3923193d6a78ee8456b4599837596b12e00e068181238d86b50a1dc0
font_02_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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