Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ac5554cea13e2c…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 17:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 541a7eb5a70dcb1caf4d8c07625361bb SHA-1: c611cd675d52dcd5348ca7cb914ceccc0c8c3429 SHA-256: 13ac5554cea13e2c8f3034ed0e13de6bec945237bc45381df3c10ced8a23eea5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=marking+guide+massey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427820/normal_604a8a55ad51c.pdfIn PDF document text
    • https://cdn.sqhk.co/nafolekuge/jjggtzm/best_android_tv_airplay_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/dF8Yuhe/suxibotorilewonenuvik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_605428e68fc8a.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/jgeGU0r/90629841562.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/sgdMZii/4505253483.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/gijYibh/kokonu.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/gupidepabewavuwok.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/hJibgfh/basketball_national_teams_rankings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/how_to_use_my_verizon_phone_as_a_hotspot.pdfIn PDF document text
    • http://zezofakarol.myartsonline.com/kerat.pdfIn PDF document text
    • http://senawoxagijajo.onlinewebshop.net/new_american_standard_version_bible_free_download.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/41342488943.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/tepujoragega.pdfIn PDF document text
    • https://5c1f1dc6-d8dc-4ed9-951d-9a6050f495db.filesusr.com/ugd/b972d5_77f56192d4bc4e85a8783bcee7085c6a.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_ed69b6d1e69b4595bca402323bc0da93.pdf?index=trueIn PDF document text
    • http://ditanumugagoma.myartsonline.com/autocad_2020_activation_code_list.pdfIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_87c8a2bf979c43109ffd48b1b117cd96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/45297571306.pdfIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_97d704350e1e498d9b9d25b60060bab3.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_fe186496bd544e52b3c24002ecb67a3f.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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 4436 bytes
SHA-256: 93cd8ec0b4a1a5477b892516b9523a274c362f716d47cd49623f530385c84e83
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 5284 bytes
SHA-256: 9a68e2ec4c724b453d5caafbf9e452fe20210f02935a9efd5fc4fd42729f22fb
font_02_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 10896 bytes
SHA-256: 6388ecd4d5e967f666982d06533c11b8785c26985fdc4daa7daa2767f60bef0f