Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d61dc99de30a5f…

MALICIOUS

PDF

48.5 KB Authoring application: Pdftk First seen: 2020-09-24
MD5: a271ad00b9b86ade410d5533f731737c SHA-1: 605b93628e43f8490f224bbf0ed7f3d151abcc4b SHA-256: 85d61dc99de30a5ff5d786ea932b428b1782a9959fa0b46ef417f6138cbe946a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external PDF files, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content through these links. No scripts were extracted, and the document body was heavily obfuscated and truncated, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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://davesbiblestudy.net/uploads/1/3/0/4/130435690/sirozisilir.pdf In PDF document text
    • http://mosaicvoices.net/uploads/1/3/0/4/130476493/c47c76c7.pdfIn PDF document text
    • http://aratikreibich.com/uploads/1/3/0/4/130477633/mevogurenejebonopa.pdfIn PDF document text
    • http://thaitogether.org/uploads/1/3/0/5/130539114/jererupotelu-wobumatarijen-renivetofajar.pdfIn PDF document text
    • http://konstrukcjestalowepila.pl/uploads/1/3/0/4/130488365/zafarozetifi.pdfIn PDF document text
    • http://sookeyhairextensions.com/uploads/1/3/0/6/130604104/nipajarobit.pdfIn PDF document text
    • http://lexington-mls.com/uploads/1/3/0/5/130538922/6074876.pdfIn PDF document text
    • http://thefirstresponsegroupllc.com/uploads/1/3/0/6/130620522/6862411.pdfIn PDF document text
    • http://e-proger.site/uploads/1/3/0/6/130639398/funubemebavavitewa.pdfIn PDF document text
    • http://nativeuniques.com/uploads/1/3/0/6/130603918/sizejeratadi.pdfIn PDF document text
    • http://stingraysbaseballclub.com/uploads/1/3/0/6/130622089/nasuwune.pdfIn PDF document text
    • http://bartolomeilaw.com/uploads/1/3/0/5/130550721/130550721.html#power+of+magnification+microscope+definitionIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000433f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x433F 2944 bytes
SHA-256: 1d269f634ab73c11f3b4966065b7d9c19712592f510abd002ed21bf1e31af43d
font_01_sfnt_off00004cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF6 16432 bytes
SHA-256: 0e1b61e73add48d6c04776718934017f4fe4c3e62858eb2a92e98a24a0587737
font_02_sfnt_off0000660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 8456 bytes
SHA-256: 088eab23217b415cd80a75ae63bd8567f1926bb4289ad471df2ad7d00d4976bc

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