Malicious PDF — malware analysis report

Static analysis result for SHA-256 776a3944cd5b76c4…

MALICIOUS

PDF

73.4 KB Created: 2021-03-04 19:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: abf7953d11c01dd9ca27adce795bf0b7 SHA-1: 4b51530b40f1844f426e97455b8e4c9e9f3ff6bc SHA-256: 776a3944cd5b76c4799b6d2fa246e892e21d77d362b8cfa6b91128dff368ed92
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://jumiwimov.ru/wix?keyword=i+kissed+dating+goodbye+pdf PDF link annotation
    • http://ranking-se.com/les_mots_invariables_cm2302lu.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/xobeximiv.pdfIn PDF document text
    • http://qrastenmap.online/ramusedjbbd.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/wagodorol.pdfIn PDF document text
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/4089178.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/maropibovitelawuzozikejuv.pdfIn PDF document text
    • http://scarcebook.com/all_solitaire_games_free_onliner6ewi.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/irritrol_total_control_24_station_manual.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/10475333477.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/wusinedesidifuwebe.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/965984.pdfIn PDF document text
    • https://sofofiwolasaxu.weebly.com/uploads/1/3/1/8/131856039/noresipedepeweb_fabusuvorupas_wezevulutupese_zakog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_e660dcf247374c538ee1518d044a2a64.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_b64c2873fef946cf9a39fdb9b079a276.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_28c69738ac1c404083c584647ab1351d.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_2c874a7cbc5745ca8cd309254c7b5494.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_dd471f8b2e554748805d446aeff45e6a.pdf?index=trueIn PDF document text
    • http://pewuzakij.epizy.com/free_fillable_acord_form_125.pdfIn PDF document text
    • http://pimovutune.rf.gd/catheterization_lab_report.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_6d65ac07a2a04799ab36b2806b2b6c05.pdf?index=trueIn PDF document text
    • http://gonegexunu.myartsonline.com/wopabopilibudolitolo.pdfIn PDF document text
    • http://jonivobo.rf.gd/ruxujazupalusesuk.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_8953661e638341f882748f4c35219f6c.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_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 5324 bytes
SHA-256: 642d0a39c99556229c5b2a48b300baa2c526394e9e927a07f157a1a69143ab7b
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10224 bytes
SHA-256: 33577f88ab3641f3c212b499fdd18a4d2b62a55cfc40e076c19c7043a74b3dee