Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90ecdfedec64c90…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 21:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: be7e56da4e69146d545e27e114955873 SHA-1: fa550c50b73ff15143ff8c4c16182e261636edf7 SHA-256: f90ecdfedec64c90dbc5abc5c5f7d380c241cdbdff2e40438ed1804f158f7afd
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 hosted on disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the attack vector.

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://kuzutuzo.ru/aws?utm_term=how+to+set+a+lux+tx500e+thermostat PDF link annotation
    • https://kolukofutire.weebly.com/uploads/1/3/0/7/130740340/d8d4d754eb.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/gijaxapodu-mefasonofikok-fabiki-kalefeniv.pdfIn PDF document text
    • https://xoririsi.weebly.com/uploads/1/3/4/8/134848275/040bdfc5.pdfIn PDF document text
    • https://bazawafamojuw.weebly.com/uploads/1/3/4/5/134508147/bipovebavu-wavojegafajadem-wibinavuvi-wuwemekige.pdfIn PDF document text
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/muvujalepej-kiretobediboloj.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/4808c43.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/266e0f37d192.pdfIn PDF document text
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/c1e2afee6.pdfIn PDF document text
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/09778554fd75f5.pdfIn PDF document text
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/1181334.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/cito_begrijpend_lezen_groep_7.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/bushmaster_xm15-e2s_hbar_review.pdfIn PDF document text
    • https://lolefisad.weebly.com/uploads/1/3/5/3/135344485/lowor.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/how_to_change_battery_in_g_shock_ga_1000.pdfIn PDF document text
    • https://regamozinog.weebly.com/uploads/1/3/0/9/130969170/rodanubaf_maxavagoribukug_kisozorepa_xotogupejavusot.pdfIn PDF document text
    • https://mijawogutudegi.weebly.com/uploads/1/3/4/3/134374589/mezom.pdfIn PDF document text
    • https://zatalabevixet.weebly.com/uploads/1/3/2/7/132741241/b5dc8957a.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/bdb222bc-7fee-4b40-ba68-e65ebb65eb49/how_to_use_brain_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e486c773-97ed-41db-858a-ffffaf3283f0/a_knight_of_the_seven_kingdoms_novella.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aec9720-2d12-4ae3-9766-70f415b16a7b/star_trek_discovery_season_2_on_cbs_tv.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/35186827897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb36b5b-2d7d-4664-a25a-d6f349488ca6/ruginaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b57234e-e8d7-49ab-b865-a953bed00df5/wapiroxawenunuzobib.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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 5312 bytes
SHA-256: 53d6e4b0855e4773e7e3773245a0b00e0e02354f3eba7d1b17a339e249e31768
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 11276 bytes
SHA-256: 550f6fbea17c361df719a8556cb75311b4236064528a2cc00129fc7fab776de3