Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99d754ab1a4169a…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 04:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 047cf7f66ab3bbbb8d7db159bfecb879 SHA-1: 65f54fca66cbb9f2763652259d33f1cdefdcfeb6 SHA-256: f99d754ab1a4169a96773d2ab1a28910b0016d268f9be0c3ba7123b1cf225230
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. One of the embedded URLs, 'https://resalured.ru/aws?utm_term=how+much+protein+is+in+chick+fil+a+nuggets', is suspicious and likely leads to a phishing or malware distribution site. While no scripts were explicitly extracted, the presence of PDF-specific exploits and the nature of the link farm suggest an attempt to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/aws?utm_term=how+much+protein+is+in+chick+fil+a+nuggets
    • https://cdn.sqhk.co/zadorari/jibibie/15529681610.pdf
    • http://zofunubesosena.mypressonline.com/pdf_text_to_speech_software_free_download_full_version.pdf
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/59e831.pdf
    • https://vovasodakujex.weebly.com/uploads/1/3/0/8/130874601/xitijope.pdf
    • https://vexofemefenulo.weebly.com/uploads/1/3/4/5/134594555/zizaloveke-tolemixe.pdf
    • https://cdn.sqhk.co/vekasurox/BjhKjdU/stress_management_tips_for_working_moms.pdf
    • https://cdn.sqhk.co/bujasugawo/kbij1he/spotlight_x_room_escape_chapter_2_level_1.pdf
    • https://tupevunokojig.weebly.com/uploads/1/3/1/4/131454116/rodijawewaselu.pdf
    • http://rivilidopu.medianewsonline.com/xebesabuvepit.pdf
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/08b6b.pdf
    • https://cdn.sqhk.co/kozuvurop/Ogiiiha/descargar_chatous_hackeado.pdf
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/9102590.pdf
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/8939914.pdf
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/budofiluxumukeba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafijukopa/super_mario_land_3_snes.pdf
    • https://s3.amazonaws.com/vefagotoje/69636208035.pdf
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_0693621072a94169a845070a24d8e14f.pdf?index=true
    • https://s3.amazonaws.com/lomogas/lic_jeevan_anand_premium_calculator_excel.pdf
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_31bed8f4dd2548c9a986e1f097f1f899.pdf?index=true
    • http://vujuvisesakok.myartsonline.com/aquaculture_technology_and_environment.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e676.bin
d162f2f679445a30b5c88730c3e5019ede4caee3d8dcc54bd1442f62648e765d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 5548 bytes
font_01_sfnt_off0000f93e.bin
d787a855f1dea88cf51e23063fd8ad556ecd9020af345b243e7e5011a27ab877		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 10876 bytes

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