Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7987912e80812ee…

MALICIOUS

PDF

79.2 KB Created: 2020-12-28 08:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 06fcf6610055bdf5ba134f867525d42a SHA-1: 474dd98e1a8a8be955198064b7f9c2bff3b75ffc SHA-256: f7987912e80812ee387d92c51baaa3fff0c2cac54049a882abc280ff87f92cdf
234 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the PDF structure suggest an attempt to redirect the user to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=running+with+scissors+pdf+free+download In PDF document text
    • https://cdn.sqhk.co/kujusiru/chdxQge/president_simulation_game_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_5fd1bb9814d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5f9229a40804f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f962726018b9.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/jbjidie/95690746375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5fc4a67cd27a5.pdfIn PDF document text
    • https://jakinazar.weebly.com/uploads/1/3/1/0/131070367/9421113.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/agj0jbe/funawiziputapadazuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_5f9be2c2c7a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_5f9be73406db7.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/1fdd0ac5-c7a8-4940-83f4-1b129de21747/44381526484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dca1fd4-dbbe-4a89-bd39-5adb4b2092ed/44779910141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca4ed2d-edd5-4e9d-8528-b188719eed63/youtube_christmas_vacation_-_movie_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf57040-a11d-4db3-a702-a1edf0ceef52/85613607071.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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 5516 bytes
SHA-256: 8170b0ead694400ff2bdc8c56fd705f71c556a3489c1184a5cedc396443f6040
font_01_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 10472 bytes
SHA-256: 23b78d1b76a61aadfa560ec83b26719221879bf180a3d7d797223f2ee09d6f3b

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