Malicious PDF — malware analysis report

Static analysis result for SHA-256 35316652f49f33b8…

MALICIOUS

PDF

80.8 KB Created: 2021-04-20 23:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4d8be7314ac8def8f3df214c94e76ce1 SHA-1: 335daeccb0c25c5dbb8bac2cbe0630a8b7bb2730 SHA-256: 35316652f49f33b878abe461ce7a66a6254c5dec5f96ae66f402e9defe99be73
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 hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=black%252Bdecker+18v+cordless+28+cm+string+grass+trimmer PDF link annotation
    • https://cdn.sqhk.co/lebereme/b6l2xjj/jigulifejumix.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxovugefulo/qhioRhb/lokexisimaketerogix.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/vtWidhe/rixudivasesan.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/TVfijGW/allen_theater_las_cruces_cineport_10.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/KgjOgpY/english_to_spanish_dictionary_apply.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/fhigcjd/nursing_home_office_manager_jobs_near_me.pdfIn PDF document text
    • http://fesupopimos.66ghz.com/78934021848.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/Znhghjb/step_by_step_snake_puzzle_shapes_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/hNgcmXT/45299109186.pdfIn PDF document text
    • https://cdn.sqhk.co/bevizewo/ZJidpjb/how_to_iron_a_t-_shirt_properly.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugisaxap/7cXiajQ/74967386390.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_38229f7336f64790831c2a3240a30be4.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_76340a29188848ebb0d7d73c4a39dcf0.pdf?index=trueIn PDF document text
    • http://narolojekidutaj.rf.gd/xapexawizezibirik.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_63022cf0be414231b527599b59b325b7.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_e86ac7c8b0214d0d9703bf228c43b7de.pdf?index=trueIn PDF document text
    • http://deroselewem.epizy.com/59458518507.pdfIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_1a8f4026e6414b38b86d76acf1d9e21a.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_35bf23c3b7ee4df3a19aaaa1b4167670.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_28916f6e64434a939d077524142b0c77.pdf?index=trueIn PDF document text
    • http://badasex.rf.gd/xuvumufikenuve.pdfIn PDF document text
    • http://luturuwuxas.epizy.com/vififi.pdfIn PDF document text
    • http://sitiwaruto.rf.gd/netflix_s_not_working_without_wifi.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_12ad2db9760941089f48794198e8fd1a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 5808 bytes
SHA-256: da277a192bb1d6dc0559ddc43c4214c8fcba491f6d991bd952ad61efae4eb8d4
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 11136 bytes
SHA-256: c339f4fd293f8d9938b253090af4cfd7f8aec778f363c1ea00add0d6eb020f9b