Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9111b18533b161f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 07:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff15e500c072b149a63d3020b13ca07b SHA-1: 1115a1c5bb1b1b4303acb36bf166116e08fb18bb SHA-256: a9111b18533b161f7fcdf206cb67c7c27d59fc0f43d737475d798b2f49136ea0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xezojetit.ru/strik?utm_term=troy+bilt+mustang+42+mulch+kit PDF link annotation
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/ccbf6a3e8f162e.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/bogaw_fonodimilewol_pixiz_povopobonemajet.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/7952733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414696/normal_6033b9d519d6d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/JifhiZu/75765283766.pdfIn PDF document text
    • https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/3e72634f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fc9e6a9ce7d5.pdfIn PDF document text
    • https://cdn.sqhk.co/senagoxosog/jalVUBb/love_pin_rescue_pull_the_pin_games.pdfIn PDF document text
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/9916758.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jjfqIjj/clash_royale_free_gems_generator_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_6054fc452bf01.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/Pgexcql/online_gambling_slots_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/qEghyMp/52063734954.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://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_31241a1b9184408589541926f8a410c8.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_16481fe520ab484b88ce0524bc43029d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8618beac-ba7c-4ada-a7a4-7d0464cc8df2/how_to_turn_on_the_nordictrack_s22i.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_e321fb43dae147fa9f97e78aa84cccbe.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_1660caf16121484baee7b282fd3c7d21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e944ccb0-dd7b-4546-8710-cdb78f73a02b/tumuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbf4fa0-11f7-4166-84ca-d27ae8fe69dd/seems_to_be_fine_synonym.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_8422a74ee4cb4dd4aadac92ba6f40e6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a9f26e-e26e-48a3-b7fe-938facdbd768/domawet.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_62d15983c7484108b31e7fc134d63bf3.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_62bd67b8841a4f398db484d6c049c3a3.pdf?index=trueIn PDF document text
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_0cf7908cb56d43b995fb3924f58d8e9e.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_abd24816e60e40ed99af265fdf30bfd9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 5452 bytes
SHA-256: 131d5033a6484d3815a404ebb9c0fb90934c6335bd4bf35cedcac82c15105e8d
font_01_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 11420 bytes
SHA-256: f4d86a649b1ee72607fb9bc378e51e007c5cca49fc7975ab9fe07765d050272c
font_02_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333