Malicious PDF — malware analysis report

Static analysis result for SHA-256 867bf9ed26e1931a…

MALICIOUS

PDF

78.3 KB Created: 2021-02-16 08:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5762dcba15a1ef51cbb088536ba7bed2 SHA-1: da1623b6d4b6ea73cf0a3d543870d478bb3e5b55 SHA-256: 867bf9ed26e1931ae3d197fdbae4862e38415d6a927b57083ec9ed6751500b47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many pointing to disposable domains or link farms, indicating a likely attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation of a malicious intent behind the link farm. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of specific content lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://baarspo.ru/strik?utm_term=maven+eclipse+install+dependencies PDF link annotation
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/7508097.pdfIn PDF document text
    • http://callup.today/wunikafuxnu6da.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/moxukekudi.pdfIn PDF document text
    • http://bodibuburotegi.22web.org/light_reflection_and_refraction_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5ff45c06cde78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477892/normal_5fc798f7e22f0.pdfIn PDF document text
    • http://svoydvalend.xyz/what_foods_lots_of_caloriesf2dcn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387819/normal_5ffc81e61fbdf.pdfIn PDF document text
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/voxevuvu.pdfIn PDF document text
    • http://mritzoliver.design/mob_org_android_games_gta_san_andreasdsp4e.pdfIn PDF document text
    • https://devojakosumu.weebly.com/uploads/1/3/5/3/135314674/silotisepap.pdfIn PDF document text
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/rexotiwevukikina.pdfIn PDF document text
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/5925034.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/jigoj_kegelabewojigo.pdfIn PDF document text
    • http://pasetbs.xyz/visualizing_technology_7th_editionv4kym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_600a052646ba1.pdfIn PDF document text
    • https://xekukagakodepa.weebly.com/uploads/1/3/3/9/133999272/rirojawizi-lizega-budatatej-juwizunufabubab.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/piradi/maine_lobster_license_test_answer_sheet.pdfIn PDF document text
    • http://ditiziwux.rf.gd/heartbeat_game_mod_apk.pdfIn PDF document text
    • http://zevuketeno.rf.gd/zurugopesu.pdfIn PDF document text
    • http://zerujafulo.rf.gd/25206720850.pdfIn PDF document text
    • http://tozemuj.rf.gd/marcha_claudicante_antilgica.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/46281973328.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/oxford_word_skills_basic_audio.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_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 5036 bytes
SHA-256: 2e6c1aaee9e67fa21eebb23484ce34d5d920f5390a204eb9cc1a196dbc73c914
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 11180 bytes
SHA-256: b44155e7a505f2651ef26a3b30f02ab744b13f784bb0ce53ac4af62a7cb3da0d

Open this report in the interactive analyzer, or submit your own file for analysis.