Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f1388a2db8ead0…

MALICIOUS

PDF

82.0 KB Created: 2021-03-31 00:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a06c63266c33fc98edfa3842e3401ee5 SHA-1: 635d7cde15e12eb63f1b55b735457c364371cade SHA-256: 26f1388a2db8ead05fa03f581f21ee4eb51652b9144fa3e2eff892840660174f
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 SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/award?keyword=tratamiento+farmacologico+anorexia+nerviosa+pdf PDF link annotation
    • https://kitorulefif.weebly.com/uploads/1/3/4/3/134331375/vowulipozapalinex.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/vumunivosafirusedabenedel.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/gicjdGN/vopoxomevir.pdfIn PDF document text
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/2531739.pdfIn PDF document text
    • https://fabopabe.weebly.com/uploads/1/3/4/7/134704260/c59be9594933ba.pdfIn PDF document text
    • https://megevoweroke.weebly.com/uploads/1/3/5/3/135351245/mezizewagowukigoxuv.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/ghKhbij/17608165554.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/jXjiOm2/minecraft_pocket_edition_mods_for_free.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/roxewafa.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/b8Lpj3r/50319600257.pdfIn PDF document text
    • http://mebovaduzi.mywebcommunity.org/wijagitazowipogepodivovoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzukada/7Lhciv3/css_stylesheet_in_jsp.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/xapes.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/dShg3je/58361768067.pdfIn PDF document text
    • https://bopegaxuz.weebly.com/uploads/1/3/1/4/131406849/7538168.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/66XkjjX/idle_transformation_lizard.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://uploads.strikinglycdn.com/files/9a35c4c6-1ada-4646-8bba-9e206fd26ba4/sonicwall_tz_205_datasheet.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/assertive_sentences_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bafb5b-66a3-4937-ac69-fe873e8ddd98/guitar_chords_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9356d9d-1aec-4222-9c56-8e4b783ccc70/dosadejudarapana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9ca139-18de-43c6-9500-5864e6cf4ee3/nikon_coolpix_l310_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ad15b7-ca7e-4777-aa59-c5fd039bb903/elastic_potential_energy_worksheet_answers.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/bill_of_sale_florida.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_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 5340 bytes
SHA-256: 187c5af6daa0357bbb6435d1b6b2149504b579c6d497b24c3bc1838dba30575d
font_01_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 11704 bytes
SHA-256: 3958d76b032cbc95d9a31b9f6d07237b4ef170f662f528d5225635603e00b1e3
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333