Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e63b78c66d192e…

MALICIOUS

PDF

77.0 KB Created: 2020-12-15 00:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 62223d6b440dc8513e21da17979f32f6 SHA-1: efd3ba28a6876a3d005806ec1b1a2857c8f13eb5 SHA-256: 18e63b78c66d192e5fc0a1cf220932f2bb68566d695c9a4c24e8099bda4d9fe4
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://traffine.ru/123?utm_term=printable+drivers+ed+worksheets In PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/latutuf.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/jovesomukazaz.pdfIn PDF document text
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/supitosam_nolepebinagod_vemaluwes_gufasilagusabap.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/nufelunurixubenu.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://uploads.strikinglycdn.com/files/f5b18afc-aa14-4e45-85f6-666d0ec2fa3b/nazowuvawasogubenuxapuw.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/nda_2018_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2bb7cc-c322-4a28-bd1b-a91e7560ef31/70952413184.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6b1d9403f5353fdbe0a77/t/5fd6e3023ebe04163173054c/1607918339349/ebay_app_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ae7541-18b5-4a57-8bbf-ea2f738e585b/tpr_hyperlearning_science_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd3705a-92d5-4a00-94bc-2e6c96d5c087/house_of_leaves_book_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca0a147-a677-4d09-a9c5-37a34f603a51/muzigijiroterunov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67106c1a-b1f6-4473-8ca6-b62cbdb9a751/43879136664.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/reference_manager_11_software_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 5060 bytes
SHA-256: 62945dc0ca097b9591fbaeaacdf55f42d648bdff61ebc8cdf69278fe651ce4a8
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 10944 bytes
SHA-256: 5c50d3ad518c604f94bf16aa0862cce429896bd1de1359607ed6537ee7a166b6
font_02_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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