Malicious PDF — malware analysis report

Static analysis result for SHA-256 23075162f948532c…

MALICIOUS

PDF

93.5 KB Created: 2021-04-01 17:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fa87fe9b4cce97d6b0bc4fe5e3757ccd SHA-1: a2ae2f128a733fa4657cf2283e0b4184f1951a09 SHA-256: 23075162f948532cae6da44b33a7f7e5be42036baae9f5b2c23059c883bddf7c
186 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous other PDFs hosted on various domains, including disposable ones. The primary lure appears to be an "answer key" for a math topic, likely to entice clicks to the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=special+segments+in+a+circle+answer+key PDF link annotation
    • http://fishland.store/jurassic_park_bookevlc3.pdfIn PDF document text
    • https://rifusefabizavi.weebly.com/uploads/1/3/2/3/132303317/gewizatejuzo.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/pazed-xarunokarebol.pdfIn PDF document text
    • http://thehensleys.org/25292159167y5znf.pdfIn PDF document text
    • https://domoposuselof.weebly.com/uploads/1/3/4/7/134720049/luxuvowaze.pdfIn PDF document text
    • http://uablog.website/preacher_graphic_novel_box_set6oazn.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/edd7908.pdfIn PDF document text
    • https://zasaxagojipazu.weebly.com/uploads/1/3/4/3/134381031/7259621.pdfIn PDF document text
    • https://miteviwu.weebly.com/uploads/1/3/6/0/136006965/7848177.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78de399b-5cb1-4d05-8290-e7933402b20f.filesusr.com/ugd/10f998_4d1a01b37bb54321b0a431b6dcaa72b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninasivol/gvim_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acbb550-1e5b-421e-979f-841aefdb6c3d/where_is_cia_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e3d469-8399-4483-ac7e-953719757a64/33225970787.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_357e41f235c14b4cbbc7badbe675acb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8664650e-da3d-4b09-b6c1-1669d0b28488/22432134725.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/android_application_developer_jobs_in_india.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_848d5fab466d44c6a13f8e638bb27647.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 8348 bytes
SHA-256: b1727de0a2a05146cfc7a9bf6fc0aa1985ecbbe4545a44f85dd98d2a449906bd
font_01_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 1964 bytes
SHA-256: 7dbbb8a6cbe2bcdcd65dd0b715311a4b962aaaaf1e4a34f9cfc7d37fb941540b
font_02_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 5612 bytes
SHA-256: 854b76f85d29e466272acb222f22b2bb4d220571beae23aa93e801c5ac9001c3
font_03_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 11412 bytes
SHA-256: 9894b3cf5d543b11d40ef9caf40117a81743b38dc68e05b7fd07703cfe06a3d4
font_04_sfnt_off000152cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CC 16088 bytes
SHA-256: 3c1c7bd747a9a8f6e1c531457064e9378d9a893e5271ac7381d9d0015290d8f4

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