Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f50f2393ef3f2b…

MALICIOUS

PDF

73.8 KB Created: 2021-05-16 07:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2787e233bc3fc907b1348e6f57eb2205 SHA-1: 55b4225320aa30416751d35755d4c0acfe418a5b SHA-256: d4f50f2393ef3f2bf33334776554247d55d59dad6797f2667e37ab49c72eb53c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, and the presence of a URL with a 'utm_term' parameter implies an attempt to track user clicks, common in phishing campaigns. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=diablo+2+best+class+for+solo+hell PDF link annotation
    • http://swiss-gear.store/12216289144vqz8o.pdfIn PDF document text
    • http://reflectionss.space/1814435160348ojx.pdfIn PDF document text
    • http://abwaab.su/km18_bluetooth_manualkse7x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_6047f4b4e3a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494451/normal_604154e03e160.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/fLgjOjb/12332106652.pdfIn PDF document text
    • http://ver-alex.website/pakusazije3wmxg.pdfIn PDF document text
    • http://jisipajimeleja.22web.org/rigagapixinupidawejopax.pdfIn PDF document text
    • http://capridigi.com/2623376285537k34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_60674f3545c23.pdfIn PDF document text
    • http://centerverifybadge.com/viwixxlxnj.pdfIn PDF document text
    • http://lotto-investclub.com/libros_de_metodologia_dela_investigacion_cientificaly3cc.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/the_antichrist_nietzsche_download.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/catalog_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450356/normal_5fefd28daf7b9.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/22761309109.pdfIn PDF document text
    • http://creditpm.com/bebawunirajlqhu.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/cJkhbsg/8191138487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_602eaf89659b6.pdfIn PDF document text
    • http://organic-ita.space/523786348883id1r.pdfIn PDF document text
    • http://alteramaks.world/blender_2._5_free_32_biterplx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukuraxoviniron.rf.gd/tuwaridof.pdfIn PDF document text
    • http://tosopipates.epizy.com/mitochondria_and_chloroplast_worksheet.pdfIn PDF document text
    • http://dasutako.rf.gd/89738727910.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/rukozumugexiluki.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_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 5240 bytes
SHA-256: f25e12c0089ee5abe86f21a81007082c4b031fbad7fb1667d020da3f111201db
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10180 bytes
SHA-256: 3351f947d9678df62cc5b53ddb0708a27c13a676a9bfb4ff3b80ad20e55c49ef

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