Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf42f802708a85b…

MALICIOUS

PDF

157.1 KB Created: 2021-04-23 18:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ee5a9f1d0e3e5cc420d4745d2a2c4042 SHA-1: 55305944356d87b254149a6fd5002cecfd3ec242 SHA-256: 4cf42f802708a85b21496d61299d8e31b1cfa1a9da3141509656859bd5db7a6c
206 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to disposable hosting and employs a remote support tool lure, instructing the user to install such software. The presence of embedded URLs and the overall structure suggest it's designed to trick users into downloading and executing potentially harmful applications, possibly for remote access or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://soxebez.ru/strik?utm_term=serato+dj+pro+download+apk PDF link annotation
    • https://pilolekolaf.weebly.com/uploads/1/3/4/6/134655903/5ebc781444e587.pdfIn PDF document text
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/5de20.pdfIn PDF document text
    • http://xefatoge.iblogger.org/bipuxi.pdfIn PDF document text
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/6432273.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/516c30.pdfIn PDF document text
    • https://tofixotiz.weebly.com/uploads/1/3/4/6/134621190/a1a947b287bf842.pdfIn PDF document text
    • https://zibesotisudub.weebly.com/uploads/1/3/5/9/135996238/2db895.pdfIn PDF document text
    • http://13millions-warzone.store/15273175179zszew.pdfIn PDF document text
    • http://fresh-ita.space/marks_mechanical_engineering_handbook26ud6.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/1705607.pdfIn PDF document text
    • https://dowidevegep.weebly.com/uploads/1/3/1/4/131406741/zifosomi-fovafibok.pdfIn PDF document text
    • http://gtomishebs.xyz/life_science_grade_10_term_3_topicskbmz0.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/b7c57b19-a59b-43fc-935b-6a78456ffaa5/forklift_training_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/how_much_is_the_101_bus.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/canon_pixma_mx430_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b7dc10-8503-404d-b4e2-475f31c04d59/vukafiz.pdfIn PDF document text
    • http://jodofinefurow.rf.gd/tenofevazodododigeripujap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c499c1c8-01f2-4ef1-84e1-1c12e749f85e/59549317972.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/agreed_upon_procedures_example_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/how_to_use_digital_blood_pressure_monitor_omron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d908592d-6baa-4ff5-8dc8-16a1d0771648/wonder_palacio_amazon.pdfIn PDF document text
    • http://bexiguxiluk.epizy.com/15497403552.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/jodawujirogovujibuvar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea2ed27-0d82-4760-a3f8-abd3de099adc/what_is_the_role_of_oxygen_in_photosynthesis_and_cellular_respiration.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00023297.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23297 28332 bytes
SHA-256: 80e85c8a6087e9ce8c66226468a9f791d330fabfe73dbfa567db290ca8433958
font_00_sfnt_off0001f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F833 5112 bytes
SHA-256: 58aabcdb6badb27d5190977904e1db29f9cd38418ce5e35c37fc59c7d034d6f4
font_01_sfnt_off000209b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209B6 12500 bytes
SHA-256: 0634330b395e61b26b45e162ccf62222fd57ea1de5d11789ff63f366c9f81b60