Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a1b373ce756909…

MALICIOUS

PDF

74.6 KB Created: 2021-04-29 15:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 419f1b3f293733c26c94de2e0f316ddf SHA-1: 9903fdc05bdf85bf2f31c7c94fbcabb0b7d88596 SHA-256: 02a1b373ce756909fa99d4deac644c2c891532814edb12ad52a6c5874ea5b7e0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/strik?utm_term=best+it+course+in+sri+lanka PDF link annotation
    • http://famozosivupiwij.sportsontheweb.net/17093978247.pdfIn PDF document text
    • https://baduzewikabure.weebly.com/uploads/1/3/4/3/134317938/5588257.pdfIn PDF document text
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/jejigefotive.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/kopilizevanub.pdfIn PDF document text
    • https://wopipobije.weebly.com/uploads/1/3/4/8/134889886/4074764.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/piramide_alimenticia_para_nios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_b0483bf73dd541e9a97a30b0e50fe3f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5340e0-74f3-44c7-879f-071bb50d263c/bobosabexuwapumeko.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/what_is_the_american_education_system_called.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_b5a480dec0754564be7d34a091059c1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e5961a-8549-459a-8243-9410ab3ad2ab/hp_deskjet_f4500_wireless_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/bambukat_movie_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8cad769-5fc4-4935-a20e-f07ef136f238/novena_to_st_peregrine.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_7c20a8e5ff2e456ca17af03956e9a9b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/basketball_java_games.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/78714083760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b7a254-2129-4531-89b4-09312b129811/vuginolopujisom.pdfIn PDF document text
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_008f9a5c54f94effa565d34b2b208939.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6fec76-56d6-4adf-9035-293bd8ce73ad/74769388312.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_8d325618250a49f78b08486d9c520ad4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 4908 bytes
SHA-256: 36b8ee10d65b59c3824d0269902e0162a5712bd7c792b4ff3bb9a966b008544e
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 10620 bytes
SHA-256: 783c0ac23b84de438ec07c16f07c2ed2816f9df0ae985139f70502a7bb35e41b