Malicious PDF — malware analysis report

Static analysis result for SHA-256 7511626a482816c8…

MALICIOUS

PDF

110.3 KB Created: 2021-04-15 19:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 74af7a290e636f4f2a2a187c958044e9 SHA-1: 225b2a4cbeab1be6f68119ac39c5ffabe6acb7fa SHA-256: 7511626a482816c8ebdfd4bd43202d6ce99e0f23f4d95841bea467912039aa97
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 0.9992

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://mezovuduw.ru/strik?utm_term=batman+joker+comic+killing+joke PDF link annotation
    • http://static-get.top/how_to_read_stock_charts_for_beginners5zxaz.pdfIn PDF document text
    • http://twirlini.com/any_calls_for_messengero3x54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_e4604107a9cc4892992405ee6d98748b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a457fb-e6c7-4645-9b46-28c167d71efc/39454700720.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_eeb8e4ca5253442ebfc09b6951753dd8.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_95daf3b50b4b4902b5fea077725b2f83.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_872033c1347f4abcbda55d305fd8638d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuboki/6147946874.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_d03af4a8e466447e92070b632cbcc09c.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_904aec711a3946d29dff2434dae152c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/71308640946.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_18e8fddc5e434299b4d52897135deae9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3115056b-739e-4ae9-b053-5f6aa18f6aeb/maytag_fridge_repair_near_me.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b648c440d7d64cea8a93f091398b08be.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_ff56a8a986d74b7fa400def93753c3c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3efdfb7-7247-4439-9aae-cbe3da1b8dd4/514888399.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_fd971d3315fe42a8afec0c66c2e2dd98.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_91a3759b9ec0458093a569bbe7ecd6f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/disutul.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_608342da0c9d45d7aaaa784fd61d7d57.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_7219e9c479fc4e66866e9ea38c72508e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/75272958488.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_3077bc4853ce429eb296cb4c628ec18c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17189 5132 bytes
SHA-256: 2d0db568038b0d5c3569523c2a585fc1d863cd818b34c275aec2ce2380bb504c
font_01_sfnt_off000182ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182EF 11404 bytes
SHA-256: 4380b4750974647652bfdf468918330df60b925891c51950987592c248ff0e81