Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8b054da95b8db7…

MALICIOUS

PDF

79.9 KB Created: 2020-11-11 20:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 76878b8de2eb005088b8121df919938b SHA-1: bf9007bca33ed3ee2f0bcadb45efd1a722f53eb8 SHA-256: 0d8b054da95b8db704d09304ee805d9fb7a13676e2d9c161e2b052e0f352cbec
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used in SEO link farms to manipulate search engine rankings or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern of directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=necessary+and+sufficient+conditions PDF link annotation
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/1c81ea66114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f874f9d289fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f9fce12907e5.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/gopebisodix.pdfIn PDF document text
    • https://zifusiwi.weebly.com/uploads/1/3/4/6/134686012/pijopukonuwupu_bewibuzezizopup_zixin_kawaguwozoxokog.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/3844012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/adeca13e-b96a-4892-9679-1e9e5679a0c0/meninulaguval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7aebae0-9ea1-4eda-b809-846292e0db9b/97321855162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1c1367-7419-473b-b77e-c8569101b231/34650037807.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/xujabifa.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/guitar_hero_3_songs_for_clone_hero.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/61027706163.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/59456821580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285c9a91-731c-457b-8559-15c144e2fd65/45646948495.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 4936 bytes
SHA-256: 25086d16d1f098c694ea4efade7367106c9bd0f229f889b24fbc363ce5547c6a
font_01_sfnt_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 11500 bytes
SHA-256: 18adbc9d1d1916b94a46abe2b844adb95958615c63c6ad17d07ab68719d1f977
font_02_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 16308 bytes
SHA-256: d806554853eca10e9b181867aeb60fbd9906f76f1e1f50040d50b12331162987
font_03_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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