Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d107f08f1fb1b5…

MALICIOUS

PDF

82.6 KB Created: 2021-03-27 18:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 766ddc26b2b2cd5ce6dad87da7843dae SHA-1: 54ebefcac1034ec4b70e602d23da6f0c4db73dbf SHA-256: d9d107f08f1fb1b54c4b02da198f2cbb7afcd3d32ca27d2537b51e1a98800b73
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

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://baarspo.ru/123?utm_term=giant+steps+john+coltrane+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5fcc1f4e9aa10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420441/normal_60356fa07169f.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/pedipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_60255832c16ce.pdfIn PDF document text
    • http://wodabukinekinig.22web.org/43423775632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_602afecbddea9.pdfIn PDF document text
    • http://lumoxul.iblogger.org/join_two_excel_sheets_into_one.pdfIn PDF document text
    • https://sikediluselifa.weebly.com/uploads/1/3/1/6/131636826/2499149.pdfIn PDF document text
    • https://paxupodef.weebly.com/uploads/1/3/4/7/134763896/6397542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_5ffe640b6ec9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_6044d6b1cc52e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_601be7f287ba0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5fe1363111bcb.pdfIn PDF document text
    • http://sasezifunapa.iblogger.org/business_model_download.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/694ffbfe6e36f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5ff2dc96da528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_60125245345ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaxuxosubize.epizy.com/mivokamovokesisijalemo.pdfIn PDF document text
    • http://zodabozaloti.rf.gd/30938766812.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/83891356759.pdfIn PDF document text
    • http://gowokuvatudo.rf.gd/jifexix.pdfIn PDF document text
    • http://zapivevo.epizy.com/74711233186.pdfIn PDF document text
    • http://zajegugolex.epizy.com/bunker_hill_wireless_security_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/glacier_bay_kitchen_faucet_replacement_valve.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_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 5280 bytes
SHA-256: a4ec0fe25b78210bafbea5718b4550329568576214c5ed62de588e6b7c365f79
font_01_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 11956 bytes
SHA-256: 880ebf85f6e6ac6f8f12894143e2a7919ff7373c3f109a3e7d552752b5dd5bd1