Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed5ff3b23578463…

MALICIOUS

PDF

80.3 KB Created: 2021-01-04 01:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 84d8a6d1efa689dacca83624748b2720 SHA-1: 723cedda16139d6e0bdc0bdc6c914c5c4ef22f53 SHA-256: 5ed5ff3b23578463c2ece5a3c3b6e3b02c5c2c376146c6bf880812694577aada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, indicative of a link farm or SEO manipulation tactic, with one primary URL pointing to a potential download disguised as 'norton antivirus android apk'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to exploit user trust and lead them to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=norton+antivirus+android+apk PDF link annotation
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/7503359.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/kivirogajozibug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5fe6e88a3ba98.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/feseni/google_chrome_version_73.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04edb41a-1f65-4dbb-81da-943144d7b18f/93017822944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97600e45-92f5-4ce3-9e5b-fcf44dbf9d3e/funny_birthday_wishes_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f191b35-14ca-40f8-814c-80d080ae25f7/fovevovalufinezixegame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0b315b-b203-4b46-9534-e4cc0ec8b322/68070691820.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/74967803798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc9bf00-1b62-46cc-b956-73f9f11a660a/rinuvapatapuzategubibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5570d90f-13bd-4bb3-a0a7-7d8dd43aedce/zodukuwitebopikabizij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f3a0a2-72d7-4818-98eb-cde0728993e1/next_fdny_firefighter_exam.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_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 5012 bytes
SHA-256: 9b5e578894b5350d990577cffa4f986963a1f624166f898e033630f7bd651056
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 10868 bytes
SHA-256: 9bd9fd68b6bab56ef75b20a79ae60f70429f5880a816aa5ae6463ff7acba8b06

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