Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ccaf449be31ed8…

MALICIOUS

PDF

78.8 KB Created: 2021-05-12 23:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15529c297789a110c1c68bbc47cf58f1 SHA-1: 285ce12f4703cb7b736b85202f32fd8db36d8f33 SHA-256: b6ccaf449be31ed8cb49786b8ff14d64441eb67e70528f370ec63a008c202a00
244 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs. Several of these URLs point to known malicious redirectors or disposable hosting, indicating a phishing or scam attempt. The primary purpose appears to be directing users to potentially harmful external sites.

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
  • 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.
  • 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=actiontec+m1424wr+rev+1+manual In PDF document text
    • http://kigadotezolesun.mypressonline.com/55890198706.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/burizakoruserizoko.pdfIn PDF document text
    • http://claire-irk.ru/gimamemewotilomajiko1n86j.pdfIn PDF document text
    • https://tewenamizudeko.weebly.com/uploads/1/3/0/8/130873709/xudax_rimujop.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/nifivakosat.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/cracking_the_money_code_trading_manual.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/bubugukujagupuk_woniwo_vununojubad.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/badiweluxekofamidiwa.pdfIn PDF document text
    • http://optarfes.com/how_to_paint_a_winter_scene_for_beginners7qbby.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/13624417793.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/3cd7a1bb-0381-4766-8e9e-d7c7bc3014d0/conflict_management_skills_examples.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_0bc9d2f2b4154c6bb123b1fe657c8eb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2edbfc0-458f-4c32-8ec9-0326d5adb400/sidajasotusad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97751bd1-7b53-4b20-83bc-86aae46c71fc/which_is_the_best_app_to_learn_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fe7b7a-efb0-485d-ba30-245bceab23d8/dapakumajuwazopoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50dd33a3-fc61-4218-a0dc-68b0d989dbb9/75380746702.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_06197af99bd04904842e94f3ca716ec5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc08bdf-75c8-4867-87d7-25fd731dca09/50271783991.pdfIn PDF document text
    • http://jaminuzifibe.onlinewebshop.net/read_carmilla_online.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_83ab66c82d4648d2afbd39c97d7971fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb7dd65-2984-4343-869b-e9d29ce78573/gebabiporawakosumok.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_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 5180 bytes
SHA-256: 601e36b8db914d59fd0a42047d088531f41393c102279fe01d22f3dcedfc629f
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 11260 bytes
SHA-256: ccf4b98019119f49db8a96503f1fc9e4252db555165ba01c4a6460e3d89d0e75