Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a92ce087cfbac0b…

MALICIOUS

PDF

108.7 KB Created: 2021-05-13 14:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 219ed62511b9df64478494c5f050e82e SHA-1: 68a4eaf8048fec089f6fed319b28601c0118ce67 SHA-256: 5a92ce087cfbac0b1ef3a10f8abecda6df9d1869fc61f53b7c2f93f32d9299b5
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The embedded URL `https://resalured.ru/strik?utm_term=defining+deviancy+down+sociology` is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=defining+deviancy+down+sociology PDF link annotation
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/xegepaxegotene.pdfIn PDF document text
    • http://repair-foto.ru/nosipinasugoteo0tv9.pdfIn PDF document text
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/vezipurapalag.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/5f1Aib5/50739356317.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/iiiliez/30334296865.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/iaPjhQe/cat_licking_screen_animated_gif.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/b8e701c.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/ford_mustang_shelby_gt500_price_in_south_africa.pdfIn PDF document text
    • http://jilet2.club/74382213428y63wx.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/cc6a2.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/xamume.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/jisoj.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/451485145.pdfIn PDF document text
    • https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/3496510.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://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_620b1397a89549dc9786a39dd8933582.pdf?index=trueIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_a3604edfc3fe4c92bc2e4f6ab765f518.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_d1251d1191134978b4e6ca42e9953701.pdf?index=trueIn PDF document text
    • http://belibivizonojo.myartsonline.com/alphabet_letters_to_color.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_61df53a6f94c450a89c698a36d01cbb8.pdf?index=trueIn 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_off00015d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7F 5052 bytes
SHA-256: 04b75721a9bc6e64565316d1b23ac23c5f944fcea5815ed6e1b8f1dcfaa6167f
font_01_sfnt_off00016ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE2 11796 bytes
SHA-256: 726693a2de2a2f82f74820eda2326b0c944f7e3cdbbbd089fa21200e07f4046e
font_02_sfnt_off0001968f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1968F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176