Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3964d1167c39597…

MALICIOUS

PDF

71.3 KB Created: 2020-12-31 21:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ff485cd7b63787cb8a87f8114805a9e4 SHA-1: cd105d7cf939b7b64e7692f523dfcc9761f35bbd SHA-256: f3964d1167c39597aed395519d5213b6442fe71884fb62dc91ab1b1faadcdc11
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with one pointing to 'trafftec.ru/strik', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a malicious intent to redirect users. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0', reinforcing the phishing and trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafftec.ru/strik?utm_term=photo+video+maker+with+song+app+download+uptodown PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422136/normal_5fa4459e82934.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/jggpWhh/xatumatusaxadizup.pdfIn PDF document text
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/8945906.pdfIn PDF document text
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/a0ea3ab9a8c68a.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/vawisedovogiv_refasofad_butosapukodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5fb2b9df1d4ef.pdfIn PDF document text
    • https://terowibew.weebly.com/uploads/1/3/4/3/134370771/vizemekivaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/boohoo_size_guide_shorts.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/chemistry_2011_series.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/xaxijomawunimukizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539fb4e1-01e1-4055-abe6-7fefe62af805/49766224906.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/effects_of_alcohol_on_academic_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/vuwalepupaxezuwitek.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/centroids_statics.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/cantar_a_beleza_da_vida_partitura.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 5592 bytes
SHA-256: 6b061236cd76111d4b0180440c75d9282e3ca00f8d5eedd1420c9bb3e09173ef
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 9940 bytes
SHA-256: 67afa9c93013da37daf6606e60ebcf18a11a1bdb996aa44745d1ad8745729e81

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