Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41f9e8fbdbeaa4d…

MALICIOUS

PDF

34.3 KB Authoring application: Nitro PDF First seen: 2020-09-24
MD5: 0c9298f9c897f1f3288a880b1a33a38d SHA-1: 70adc488618deb39e239de9040f340d53cb5ef79 SHA-256: e41f9e8fbdbeaa4da808ac2c33d45ead9c2ae02b91b7eea7d48fa80cce88fdd4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded URLs suggest a link farm or distribution network, likely intended to manipulate search engine results or serve as a landing page for further malicious activity. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://ashtoninsuranceagents.com/uploads/1/3/0/5/130542940/9141466.pdf In PDF document text
    • http://taosabi.com/uploads/1/3/0/6/130639398/3044023.pdfIn PDF document text
    • http://proteus-internetmarketing.com/uploads/1/3/0/5/130590511/wotabotujix_levuximuwofubi.pdfIn PDF document text
    • http://avoloninternational.com/uploads/1/3/0/7/130776483/2955902b7af9.pdfIn PDF document text
    • http://radioroundtube.org/uploads/1/3/0/5/130589309/bafavunonop.pdfIn PDF document text
    • http://alaskaandhacheries.com/uploads/1/3/0/7/130776577/74f15.pdfIn PDF document text
    • http://digitalmortgageloan.co/uploads/1/3/0/5/130590244/84e6226acb7.pdfIn PDF document text
    • http://abrprojectsaustralia.com.au/uploads/1/3/0/5/130540155/vamedo-vekutirove-tuzaliwe.pdfIn PDF document text
    • http://startagreatfuture.com/uploads/1/3/0/4/130489001/3c2b3ca.pdfIn PDF document text
    • http://troop827.info/uploads/1/3/0/2/130289320/519037e9ac.pdfIn PDF document text
    • http://kleines-strandhaus-stein.com/uploads/1/3/0/6/130621003/janugotafadiruk.pdfIn PDF document text
    • http://hostmaster.4140designs.com/uploads/1/3/0/5/130588763/130588763.html#10+best+free+pdf+editor+for+macIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3119 7184 bytes
SHA-256: cfa2fbd7b91f962e3639847542ca56a818f08f3796bb521d33e4d3f383be613e

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