Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff56368d6379b88c…

MALICIOUS

PDF

65.3 KB Created: 2021-01-06 12:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8cba4dc7b7a260947c3cf9f500aba2ed SHA-1: 44a40841686cbd75c1c4b04785daf0b9b7106e5e SHA-256: ff56368d6379b88cd49a6c472e1fe3d6e95633c659f82d5cafae19ec3eca83ac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/aws?utm_term=spelling+test+template+for+2nd+grade PDF link annotation
    • https://zunezazawegor.weebly.com/uploads/1/3/4/6/134665047/rinisipamexunofajipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0128d4f0-3169-4382-ab0d-6003bdfcd5d3/57904022925.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/catastro_cdulas_informadas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4913d2-0c73-4382-8e0e-e53502646027/gofadidofut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c794f1-d503-42a8-a394-04f07d78e346/wasogumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c1c753-5afe-48a4-b0f1-d6e75010e4e8/jebunegemetan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566808f1-6e05-44d2-97c0-a8df5f4b734e/ditions_brault_et_bouthillier.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/cartoon_video_song_whatsapp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125e4706-b146-4f83-9554-c68a63134d66/fotileladanib.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/jijasobakumeponubazunat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb5712c-cad4-4aa1-a3d1-1d0e5d5b0a58/vikings_tv_show_characters_wiki.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_off0000c526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC526 5596 bytes
SHA-256: 3b9e7089c10bd189cd21fc3c4b2ef2248be291c83c23f86d6bca758bba87d696
font_01_sfnt_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 9528 bytes
SHA-256: a6b0f3fe141ee14e77bf051a2e8f209886ba98d1d4f4adfe142a696e05a9ede1

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