Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7962865e8573d9…

MALICIOUS

PDF

69.6 KB Created: 2021-05-19 13:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 41a5361164ad6f1685844b227e5fcc97 SHA-1: 11006023d86b4f70faa3f65c9efb994ff3980f70 SHA-256: 9a7962865e8573d99a3bb69dd468f9ba5b0d9196900484e400b00bbefd85b069
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which are part of a link farm designed to appear as legitimate PDF documents. The primary malicious link redirects to 'yafferge.ru', which is flagged as malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=atlas+de+hematologia+clinica+rodak+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6011e92628b23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fdc29b5997e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5feaff18ecf62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458839/normal_6006d72ec2e8d.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/780091.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/33934d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_6031f8f9299d5.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/topisu.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/609533ea-d697-4fc4-b426-5b21d8249f67/best_survival_games_ps4_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01869712-9aee-4e0a-a03d-65148d07b51f/89671703697.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/80300132067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edeccd07-fbf7-49a8-9f75-5a42f77ced83/56321826403.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/37844200071.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/75883160015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8432aa9c-a659-4ffa-8c99-7ca713c076ca/over_the_rainbow_violin_duet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca16156-4865-46fd-962d-533e94d4fe6f/71401111901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19439665-a434-4736-9970-32ba8eefb6bd/xbox_one_afterglow_prismatic_wired_controller_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9021dba8-ce90-427e-abbb-7336535b0b5f/88927675084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167a886d-0aae-4e37-9535-6740a758721a/kabapoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5252174d-ed52-4725-8067-73d38628f432/40784179353.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_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 5624 bytes
SHA-256: 48874625bdf3b7316a5fb358582ba6ea0a3ca74d243a56fbb309b9645b4f0ef1
font_01_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 10628 bytes
SHA-256: 0e09b464f51fa6cc6172cb4020251402439cf8a8df32b857c01bdee9ff4bcab4

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