Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f919df9cb09b4f1…

MALICIOUS

PDF

80.6 KB Created: 2021-01-24 23:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3d9fe060774c4c28de2117caf212f2cd SHA-1: b25870b0b11491c2e15c5ca11ffbba21db2a74c6 SHA-256: 7f919df9cb09b4f135d44341b10e602aa7ee9ac57670e42c4b6cafebfd33f6a3
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to the malicious links, suggesting a phishing or scam attempt. The presence of a link farm and a malicious redirector strongly indicates an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/wb?keyword=3d%20model%20of%20soccer%20field In PDF document text
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/wupalomadelikenaz.pdfIn PDF document text
    • https://navitadewota.weebly.com/uploads/1/3/4/0/134017874/7744785.pdfIn PDF document text
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/54aed.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/sezebepit/kulotafijesepanatulu.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/bloomfield_township_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/93302917334.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/best_cheque_printing_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/edexcel_igcse_physics_student_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/68174668493.pdfIn PDF document text
    • http://xadamun.epizy.com/kabotijalen.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/venezuela_food_security_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/oscar_winning_movies_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/target_costing_in_management_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/49697429106.pdfIn PDF document text
    • http://ramufezumax.rf.gd/xatelexem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 4628 bytes
SHA-256: db9f87e8c914f88821cd822ee5abff0db0b5fadaa0f2ef75095a1f20e375caa2
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 10724 bytes
SHA-256: 842baf5c11a2210e2563dcba31142ae1ebebf271d9ea194953556145a9cef149
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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