Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38261d1407f9890…

MALICIOUS

PDF

80.7 KB Created: 2021-03-23 04:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fcf3fc33572483be80cb22e8eaa8b649 SHA-1: ed199fc1ea0f8c40ba09f78e7055356bb595549b SHA-256: b38261d1407f98905f5b5e30fd929ad177d60f272651c66d54371aedcc817eff
184 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it functions as a redirector to malicious infrastructure. Numerous embedded URLs were extracted, many pointing to disposable domains and known malicious redirectors, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://dafemum.ru/strik?utm_term=difference+between+hacker+playbook+2+and+3 In PDF document text
    • http://wabizuvo.iblogger.org/selenium_webdriver_python_3.pdfIn PDF document text
    • https://nematoluzi.weebly.com/uploads/1/3/1/4/131409841/fegadexomiwodarad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_6002c6ce8d6e2.pdfIn PDF document text
    • http://busakajufe.iblogger.org/1431101314.pdfIn PDF document text
    • http://bowanizi.22web.org/14246721448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_6017064158291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_602835a8eb513.pdfIn PDF document text
    • https://jinuvavuvebox.weebly.com/uploads/1/3/4/6/134612635/00c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_60244e7ab009d.pdfIn PDF document text
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/vanuxavuzasodozozuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_6024a81279073.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/rumufixofef.pdfIn PDF document text
    • https://bofetolukolun.weebly.com/uploads/1/3/4/0/134018575/3742824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fc91edace01c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449768/normal_5fcdbe703b2c0.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/fd29bbbf-331c-4114-ae53-2a952dc4bfa8/big_kindergarten_workbook_barnes_and_noble.pdfIn PDF document text
    • http://radujexoxetapil.epizy.com/doduvub.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/pekobefolididopeduk.pdfIn PDF document text
    • http://mubadel.epizy.com/26765138334.pdfIn PDF document text
    • http://gofuvosopo.epizy.com/jefosimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58475ab8-086e-4989-a189-7ee355868a7d/what_is_the_name_of_the_plant_on_little_shop_of_horrors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef64190-5282-493f-9552-f627ca2e4410/84342454915.pdfIn PDF document text
    • http://jiguluvosasibun.epizy.com/86005045974.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_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 5760 bytes
SHA-256: f251b987ee865b18a53d04e8e2f32cab318976c3ba1e94a2d858cffd09444f18
font_01_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 10924 bytes
SHA-256: b3840791e4cf50f1477823b946aefd709f364dc9e711a478742380b03f24d3de