Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fb149d5c9eb105…

MALICIOUS

PDF

74.9 KB Created: 2021-05-15 07:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a388852b9f3d2148fb3520d355a5a5c9 SHA-1: 759932d7d4e39b335302deca268aa4ee664b1c44 SHA-256: 22fb149d5c9eb105663ec35c0423769851cf6800e3fa425221d40d2de033eaaa
186 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=does+ford+own+freightliner PDF link annotation
    • http://zemevabe.22web.org/64699768815.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/jcia0Qe/auld_lang_syne_rock_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/F2BJjjq/moto_loko_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hbgcDM1/tap_investor_business_games.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/bCgfYQq/the_pentagon_wars_book_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/766ad0f6-382d-460f-9ae4-549fe7c3802a/vopadesaral.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_1a67b08938204b93b02b94f24599805f.pdf?index=trueIn PDF document text
    • http://rovosaba.rf.gd/afro_brothers_imbewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5762470-34cf-4e6e-8f4c-8446cd991441/what_are_the_two_sacred_texts_of_judaism.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_be2c3d885950468e912b4f51193228b8.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_7ce3ee8ba99b471db54f05156d08cfcc.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_38b545664b5c498b896bfcf9eb2eb17c.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_d4cdac93b98b4541ace684a516523723.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cd9847-b13b-4a03-be57-69ef7d0d734a/how_to_start_an_online_tutorial_business.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_76559a0f9c7d46008d57e9106f685978.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d492a2f-1b07-4d5b-a11c-395893e4f5e0/48192348470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5de944-5983-4fa5-a25f-69fc23d23dcc/2002_7.3_powerstroke_fuel_line_diagram.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/iometer_1._1._0_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cd5dd7-95cc-42af-8df9-c3929cc35803/31604644150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42ec7f6-5dbf-42b9-8918-7d8ad3b78f20/hbs_1100_vs_1120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6db21e-5741-4a44-b8bc-93afbd8d2ac5/zuwutamejiza.pdfIn PDF document text
    • https://1e2e1d2f-e5bc-406e-8ade-c93a3c5db6fe.filesusr.com/ugd/81c7be_6715029980154008a5e9c6ea1a09cdfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/891cf73c-be58-4705-b867-300876a6243d/the_warlocks_hairy_heart_analysis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 5052 bytes
SHA-256: 4e7107178e60c9ae2c03a391fffaab9b46a1f34922f3e11f7b26e851fb3a03b9
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 11324 bytes
SHA-256: 39081501fe9cc2e346d18716fa4025cbd1a472112892be9ffd3aaab809643009