Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9731bf34de4810…

MALICIOUS

PDF

76.9 KB Created: 2021-04-02 15:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0180dd32ad45ae2139693d047c89a708 SHA-1: aabdb9b3814dd1332f9d1340d3d34ca7ab4ee287 SHA-256: 2f9731bf34de48109269d3f3b2e7cb9bf9e8443ba62cfd090d3f4c8ab8164eba
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, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in campaigns that use spearphishing attachments to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://antileqphh.site/choki_choki_shiva_live_apk2mz5e.pdf In PDF document text
    • http://tobufupevujuma.mygamesonline.org/loral.pdfIn PDF document text
    • http://jawowulipo.22web.org/32136947456.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/xalosidolepovebevi.pdfIn PDF document text
    • http://vopukisavenif.medianewsonline.com/57717159273.pdfIn PDF document text
    • http://esportzmlevent.com/80396295547udw88.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/nepifanerekajo_jiliberug_rifob.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/how_to_start_learning_mobile_app_development.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/idioms_worksheets_for_grade_5_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=club%20car%20parts%20for%20sale%20near%20mePDF link annotation
    • http://nedudumitariz.epizy.com/lexezojorifomejoramorodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92034d28-0d8a-4eda-bfca-46c697f63834/narukawezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5cd5a5-7cfc-40b6-8450-a519cbaf3f39/tosazevowakeleba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b3e754-24b4-42bc-a3df-72515733a3b9/mtd_8_26_snowblower_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06881cf-f92a-446d-982d-a0a21d7fba73/c_a_reference_manual_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e80208-55e6-461a-b230-6432e2639636/33065205379.pdfIn PDF document text
    • http://kitilogokufalu.atwebpages.com/sabirenejunimorobanopogab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3b8267-8d48-4903-8e2c-8b274ed73f33/72580831268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac01df98-d537-4dcf-84cb-9dfa8600c9a1/97788356980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38eaf89b-aca5-4ed8-bce1-9d40192f68c2/mini_cooper_r56_brake_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5d3e84-0012-4d0d-a29b-a5b2e4a4315f/ideal_cloud_application_architectures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d379daab-b9fc-4ec6-ba11-b501a574c4c4/walter_riso_desapegarse_sin_anestesia_resumen.pdfIn PDF document text
    • http://womunek.rf.gd/bls_american_heart_association_book.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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 5208 bytes
SHA-256: 716ac1c213d2b4dee27775ef66af1426a93876956683cd7df08544459e92fbe9
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10900 bytes
SHA-256: c187b1669f2ab59431ffca2f8559087399aa5810a60e8c38263e980c3de98d67