Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47b51b8728af19c…

MALICIOUS

PDF

73.9 KB Created: 2021-01-20 17:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ada5bdf8d48ef87d6254f56c664b68ad SHA-1: e1dc046229e8b523adb2d6c033c3b6d81adf62cf SHA-256: f47b51b8728af19cf498b9c0822a4d05c6a38d4a94331ee9e71f9e2f48af35ef
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 redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffnew.ru/123?utm_term=dunn+elementary+school+arlington+tx PDF link annotation
    • https://noregodexu.weebly.com/uploads/1/3/1/8/131871467/verewatawopaxokex.pdfIn PDF document text
    • https://site-1177606.mozfiles.com/files/1177606/international_business_degree_salary.pdfIn PDF document text
    • https://pagipakudux.weebly.com/uploads/1/3/5/3/135343553/137431.pdfIn PDF document text
    • https://site-1196465.mozfiles.com/files/1196465/chores_for_8_year_olds.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/9243831.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/bfdc174e6870.pdfIn PDF document text
    • http://ketorebagibof.22web.org/pit_boss_grill_owner_s_manual.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/1f54b.pdfIn PDF document text
    • http://vulifux.66ghz.com/cignal_play_free.pdfIn PDF document text
    • https://site-1224141.mozfiles.com/files/1224141/iracing_dirt_modified_setup_guide.pdfIn PDF document text
    • https://gorokose.weebly.com/uploads/1/3/4/0/134042322/482a684cc.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/305068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimarujevetuvif.epizy.com/cnbc_oil_reporter.pdfIn PDF document text
    • http://wepezip.epizy.com/gmat_questions_and_answers_free.pdfIn PDF document text
    • http://zorogeloma.epizy.com/36881204138.pdfIn PDF document text
    • http://latilofu.rf.gd/pegixem.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/aparato_respiratorio_fisiologia.pdfIn PDF document text
    • http://xenilesaripesu.epizy.com/34132189560.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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 5384 bytes
SHA-256: 6ba8586cc090ae9ec477e7a1e2f6b30b00ea8b5ec81cd398ab7c25da86c8c547
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 12124 bytes
SHA-256: ef0efd351dc94242fae4a24ee8ef4d64d5a2e1e4533d5a99e3984cbb1589bb73

Open this report in the interactive analyzer, or submit your own file for analysis.