Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5c825923787ca1…

MALICIOUS

PDF

76.3 KB Created: 2021-05-15 00:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 39c6701c9739b3af85964bf02bcb1b34 SHA-1: 293ee8d72d5aee85ad4002d00231665fa41b6944 SHA-256: fe5c825923787ca12dccb76a6eb02f1d10d6fe27ff756e6c668faee9762d5a2d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to suspicious or disposable domains. Heuristics indicate this is a link farm designed to redirect users, with ClamAV detecting it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The primary attack pattern involves luring users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=tamiya+blackfoot+xtreme PDF link annotation
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/abwab_us_sarf_free_download.pdfIn PDF document text
    • https://wazalitewisoka.weebly.com/uploads/1/3/5/9/135960923/putuvewopal.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/7639544.pdfIn PDF document text
    • https://nilizexuv.weebly.com/uploads/1/3/0/7/130739046/viramobotatapesop.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/biochemistry_for_first_year_medical_students.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/bhopal_city_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_8fb0bc57f880486a9cad14008bb4ddc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0925bd1e-d54a-4e36-ad19-0ea53060a772/62839649174.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_6c074ecc0f4b46c2801e286db9da3558.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bff59fe-08c7-4d81-8dec-d435bcc00b8e/the_boy_who_harnessed_the_wind_story_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4220719-0180-48c1-8829-87a8ed6721d4/dofad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8455e0df-83b5-4a03-b5b5-57f02681d308/epson_artisan_835_cannot_recognize_the_following_ink_cartridges.pdfIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_2d4aae4a088144cebe15ace15bec0692.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ecf22d4-0a18-4ee1-89ea-1dd4fb79b2b9/how_to_remove_epson_artisan_1430_print_head.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f689ead-26ee-4b65-b526-9ecda45e34c3/topukoworuxuvoxen.pdfIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/afcat_model_question_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd6fdf0-907c-4512-99f7-521f6305b655/zobuwiserawunolegowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749e99a6-f6aa-4d61-ba73-c8fd97a4e602/51944748915.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_c2326d40248c48738b388f37774e6dad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66eff34e-5935-4431-9bfc-3eab7d0dfdb2/81440540487.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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 5172 bytes
SHA-256: c3b88a84d501934810f5d0f26ab3f972d0da5416419e8ba3de319d46695cbf02
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 10132 bytes
SHA-256: c27a885d327f7907fde188612776ac4a72c53dfcd84aae2cfcd55a660a6958fb