Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc2d01e8eea8138…

MALICIOUS

PDF

76.9 KB Created: 2021-04-05 11:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c33b81fbc2e32fe0a7a6c30936cfdd30 SHA-1: d27d0853cd6b3ee272f73ad6203a49834227e625 SHA-256: 1dc2d01e8eea81381485b4d049279c9abe589b05f465eee7d0638421d7ff1cee
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and contains a significant number of external links, suggesting a link farm or phishing attempt. The document body is obfuscated and appears to be a lure related to physics worksheets. While no scripts were explicitly extracted, the presence of numerous external links and the overall structure strongly indicate a malicious intent, likely to redirect users to malicious sites or download further payloads.

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://pelibifir.ru/wix?keyword=waves+review+worksheet+answer+key+physics+classroom PDF link annotation
    • https://pigogiril.weebly.com/uploads/1/3/4/3/134397820/6e4aaf4ae.pdfIn PDF document text
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/7907795.pdfIn PDF document text
    • https://pafajarofotixo.weebly.com/uploads/1/3/4/7/134773208/a85e5cb1.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/gofilafixu/zapawakisuwepilulabageve.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/2276091133.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/kusipivu.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/nodetunukibozanulojiwiti.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/seginatajofokaw.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/netgear_n600_specifications.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/46325681844.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/ladojijava.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/73304184238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31e398f-09ed-4e4d-9aaf-2d0216ff0723/honda_rebel_500_for_sale_craigslist.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/bapovojojetowil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9966869-8657-4429-a2c1-b376021ed1ae/90010527544.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/starbucks_drinks_without_coffee_to_make_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928bd3d5-9bdc-4050-bcbf-4de73a718c7d/basoxejoxiriregu.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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 5504 bytes
SHA-256: 325d0db57e2501561b91c5c13bf8d0170c94e09c7bc687035435a119d7557fc1
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 11196 bytes
SHA-256: 03c601dda61d6f99b13bf33c08e67285eaea571086db0d4ac541fb85b168db2a

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