Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1ba21d0e770f9f…

MALICIOUS

PDF

77.9 KB Created: 2021-01-03 14:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 63d9146de5788a9bdf9b14efe4a51c5c SHA-1: e188e2418839732049185ec482bac9e0fe767172 SHA-256: 1a1ba21d0e770f9f05935ed58cc8d98afe048eeaca237a91d99b9ade94727374
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution attempt.

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://trafffe.ru/aws?utm_term=fdic+interagency+appraisal+and+evaluation+guidelines+2010 PDF link annotation
    • https://lifufokawalujiw.weebly.com/uploads/1/3/4/6/134687559/namupuvetenapa_jumowogoz.pdfIn PDF document text
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/398868.pdfIn PDF document text
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/0257740a7cb4.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/2504661.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/efc13dbe8.pdfIn PDF document text
    • https://sobegivi.weebly.com/uploads/1/3/4/3/134311910/4707203.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/tamobalasu/pirejuwoze.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/74329374048.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/45385483287.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/42529428625.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/veronijodonasefu.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/82460882428.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/architecture_magazine.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/sinutavawilanusenir.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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5684 bytes
SHA-256: 18fa718c36b3fe3ad57b46374989a932b5e59927d5c9a7daa9a8afc7c6cc1b6e
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 10648 bytes
SHA-256: da6b11281337d37402c2c31d5590783741739b815c49e89db2b127d522c15756

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