Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d6b019a059f009…

MALICIOUS

PDF

84.1 KB Created: 2021-01-04 20:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a0eb3b9fa9c5179dd59fb4eab77c9dc5 SHA-1: 6521eb2875266cb6d441625e833c7a994b3844b1 SHA-256: 52d6b019a059f009e07f666300fca061dce84528f4ad1ef94808dbe85e194b9a
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and embeds external URIs, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://trafffi.ru/aws?utm_term=recommendation+letter+for+teacher+template PDF link annotation
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/fizajavowemalobede.pdfIn PDF document text
    • https://cdn.sqhk.co/jorobasobu/GKhaihN/19757624586.pdfIn PDF document text
    • https://cdn.sqhk.co/sobilowibid/jiDkPjd/38675497721.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://s3.amazonaws.com/mogedozara/piriformis_pain_while_walking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63724200-2917-4579-bbd1-7d982ee63d7b/role_of_women_in_heart_of_darkness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4816e706-fc93-4671-a17a-d230e66bd909/nys_pta_where_we_stand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b780c01f-3bb5-47f6-96e6-45f6f6fe8279/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b71d40-ef52-4ac8-b612-074724aad359/nobigago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b32f5a2-0cab-4ae5-9f32-3499cbc53c9f/grade_8_science_june_13_answers_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971caa43-eb56-4570-8c47-8aa12d45673d/kutoduzedekawed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0263566-9dcb-4ccf-8577-f6c3da024056/rimepoxiponezokinif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99809540-1b3d-4ec8-bacf-39bb6348311d/beborobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77845ee8-acb3-40a6-b896-057ff7c1112e/zirinebisojirelidazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a49d2a7-396c-4b21-970f-d9aff02d08e0/old_world_foods_potato_pancakes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 5012 bytes
SHA-256: 65603c5586384567b8ba3923b9c98120bbf33195d1e6a2c9b2ef72679b77ac53
font_01_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 10660 bytes
SHA-256: 3dc239061a53f02f9f0112b4b1ca2bd08e5a3d869e3de3e6e5e4abf75e3a50eb
font_02_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 19344 bytes
SHA-256: 3438e223d8a30ab6a61cfaffcbc66f549a568fe58b18a8251000c34a63ccd859
font_03_sfnt_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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