Malicious PDF — malware analysis report

Static analysis result for SHA-256 6101448a16b4b661…

MALICIOUS

PDF

74.2 KB Created: 2021-02-15 22:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8454d3c814cae2f8378eac37634aee87 SHA-1: 4add6fe87b479bcb359b0e89e249d1d8fcdf2460 SHA-256: 6101448a16b4b6610456ca3b411c64619a56a67c78dc01bd86562f88ee610bac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating a large number of external links, characteristic of a link farm or phishing lure. The document body, though heavily obfuscated, suggests a lure related to a 'Kitchenaid superba 27 oven manual'. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious sites or download further payloads, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=kitchenaid+superba+27+oven+manual PDF link annotation
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/bowuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_60121ecdc3e06.pdfIn PDF document text
    • https://xefolulewonud.weebly.com/uploads/1/3/1/4/131406676/zonugogidume-kasunuduka-risugepedenu-foxabumen.pdfIn PDF document text
    • https://tijotado.weebly.com/uploads/1/3/1/3/131382447/palatejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_6004144a742ab.pdfIn PDF document text
    • https://liwujozixo.weebly.com/uploads/1/3/4/4/134497145/dafux.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/cThiO6o/33130214362.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/jexijer/adverb_of_degree_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/wepubunopebaxudulu.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/pezazipuzejizivedoredulo.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/kegoruwovozamajiku.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/cell_cycle_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/92158483473.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/bozijulunewasu.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/biphasic_waveform_ultrasound_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/kempton_park_primary_school_uniform.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_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 5692 bytes
SHA-256: 6ec1953676d7b52320c909b0232ae55de16e90865cd04720f67304a75b9896e3
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 10712 bytes
SHA-256: 7141b41c7bd48d3af8fb5c7fbfec59926953b06330733cfaa32377e7cff48ba5

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