Malicious PDF — malware analysis report

Static analysis result for SHA-256 920462e4ee083d4c…

MALICIOUS

PDF

69.8 KB Created: 2021-03-21 08:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c4efd9432dca4485e17178caff0a3bbb SHA-1: 2c282767b9c68950363e1a5615b3391d28e19d24 SHA-256: 920462e4ee083d4ccf1ca05c5d896e869f761491f9122ee0b4efe24e37113150
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://nipisod.ru/wix?keyword=the+carbon+cycle+pogil+answer+key PDF link annotation
    • http://noxogejukebe.mypressonline.com/72238211536.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/calendario_serie_c_girone_a_2020_20.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/2377688.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/1216585.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/166918890.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/jedesajasakalur.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/23325316516.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/93888434259.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/d268a739-775b-4de3-a88f-eec03eb37b30/how_much_time_does_it_take_for_a_girl_to_fall_in_love.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/tobura.pdfIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_be4c0539085d4f02bc25cec399c62375.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_f41612a2cf0b4631b77843c8b4399a4c.pdf?index=trueIn PDF document text
    • https://7162416e-a815-4e2e-b4b4-2f1b6d3d7a1b.filesusr.com/ugd/0723a7_970e157cd7544e3dbfce705cf0b07d5a.pdf?index=trueIn PDF document text
    • http://temolujipu.myartsonline.com/price_of_siemens_plc_controller.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_6b1628b7a39444e2b524aba4ddb83102.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b0a76c-523a-44eb-a63d-c540d80bb1f9/noxadudukotebixamafavos.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_30e2fa6a8ae44cc59436ce583958b55f.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_fbf4210bd5994853888cb0e006802970.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_722e755cb2fa45b8b13cc2d00acad617.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b255d8d1-f590-4e05-bedd-4fb922ff333e/pagelilixererajizubewofa.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_3b78fb228fc14382b35da95ca6b7800d.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_off0000d1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 5544 bytes
SHA-256: a26192bff6d544f689fc9c7451f525ba537720659fdf5c5b5365876d61d0a3a3
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 10664 bytes
SHA-256: 5b32d3492974f8e7a26ae055139bd0945b23a7dd4061d624627406063c1bc076