Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8284630d3b1687…

MALICIOUS

PDF

79.9 KB Created: 2021-04-03 21:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f3b12cf7f30e400ec655094667be5f10 SHA-1: 6c7c24f702f3b2d6bfb6d683f09e870e84a69491 SHA-256: 3a8284630d3b1687e114433cff1b85bf2f3224054d9d5e86986ea7afbf2c5774
186 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent URL designed to mimic a search query about Subaru transmission problems. This suggests a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs points towards a potential drive-by download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=does+subaru+have+transmission+problems PDF link annotation
    • https://rufekelikofevav.weebly.com/uploads/1/3/1/0/131070689/7336223.pdfIn PDF document text
    • https://vobezadezera.weebly.com/uploads/1/3/4/2/134265653/2426111.pdfIn PDF document text
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/7944841.pdfIn PDF document text
    • https://zilasemewoxuj.weebly.com/uploads/1/3/4/3/134318224/348cade6.pdfIn PDF document text
    • https://savejoxip.weebly.com/uploads/1/3/4/7/134722189/6669404.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/kavugusepe/99949056940.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/free_cookbook_template_download.pdfIn PDF document text
    • http://vajekalisafemun.rf.gd/ados-_2_manual_free.pdfIn PDF document text
    • http://wofiriperajune.epizy.com/16414520755.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/67664334383.pdfIn PDF document text
    • http://menumizumiwasij.rf.gd/1109777706.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/movie_background_hd_photo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4765d1-072e-4924-b5f2-d63277529fe1/fezoralunapuxupif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a1a99b-8738-471e-92a8-228c0494a370/45613618832.pdfIn PDF document text
    • http://vemevusakeke.epizy.com/kerel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aec116f-d815-4b2f-b78f-d57632a0420f/zomixefezafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd68f85-59a5-4a1e-b70b-6132469222bd/boss_dd_20_service_manual.pdfIn PDF document text
    • http://zovawawopo.rf.gd/bamford_primary_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8d7760-33fc-41b6-b149-48f258debac1/lufaloborezegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a3c784-0d96-43f6-a959-e3d5afa76e9f/how_to_use_fonts_on_cricut_joy_infusible_ink_transfer_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e99686-61e2-48f3-9dae-5cdc0f295156/65447297552.pdfIn PDF document text
    • http://tumapaluk.rf.gd/basic_mathematics_skills_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4686ed-e77d-4372-b042-f2bc227844bd/39370502804.pdfIn PDF document text
    • http://wetowotupime.rf.gd/dell_latitude_e6530_bcm20702a0_driver.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5140 bytes
SHA-256: f7f44af7c0d358b8baf1fdf9efc18390aea8ea8128e1a335c5bc90763973e4a1
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 10364 bytes
SHA-256: 3aab9d93e5339cfeebe7eeeab549944b71ef5a6a4f2c61d4fb727951b146cdba
font_02_sfnt_off000123a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378