Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bb271dae8e8319…

MALICIOUS

PDF

135.4 KB Created: 2020-06-08 16:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 5d5f1f015679a2b3910ee89ae2a54cb7 SHA-1: c9fd52be9a01e3c6b26581a4f2284b016811adc5 SHA-256: d9bb271dae8e8319c6872285bf2e2e4610fca8b4d33f92a860b6f2f00c50b013
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of an SEO link farm, containing numerous external links to PDF documents hosted on various domains. The primary lure appears to be related to 'Algoritmos teoria e prática cormen download'. The heuristic firings indicate a mass of external PDF links, suggesting a distribution mechanism for malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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 http://host54.carmichaelnl.com/uploads/1/3/0/5/130588343/130588343.html#algoritmos+teoria+e+pr%25C3%25A1tica+cormen+download PDF link annotation
    • http://samloney.com/uploads/1/3/1/3/131381769/7796394.pdfIn PDF document text
    • http://newsprintedition.com/uploads/1/3/0/5/130550652/9127194.pdfIn PDF document text
    • http://sifonierrata.com/uploads/1/3/1/3/131384201/porax.pdfIn PDF document text
    • http://lakewaypaddlesports.com/uploads/1/3/1/8/131871627/buzasox.pdfIn PDF document text
    • http://dentureexcellencespearwood.com/uploads/1/3/1/1/131164066/furadugajovetedoxo.pdfIn PDF document text
    • http://thekitchenshepherd.net/uploads/1/3/0/4/130488847/cf95c95923.pdfIn PDF document text
    • http://brightlightgroups.com/uploads/1/3/0/5/130541186/serumagux.pdfIn PDF document text
    • http://christiancounselorcooperative.com/uploads/1/2/9/1/129105865/129105865.html?canonIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fagifidame.files.wordpress.com/2020/06/nawopamol.pdfIn PDF document text
    • https://wiwifidu.files.wordpress.com/2020/06/tiriwitumaxej.pdfIn PDF document text
    • https://wuzavigen.files.wordpress.com/2020/06/zidigafafux.pdfIn PDF document text
    • https://juzakiwari.files.wordpress.com/2020/06/dumafumanon.pdfIn PDF document text
    • https://zitipon.files.wordpress.com/2020/06/47969970942.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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_off0001bf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF34 2912 bytes
SHA-256: 8e946ab76871b4001a8eb2020b863cc680b9804028e4ddcab6f6e8a2704c6764
font_01_sfnt_off0001c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C993 16512 bytes
SHA-256: 7f7985e3aade96fb7dd562a92720e74b11b73cea0a9137897e287265824f4710
font_02_sfnt_off0001f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F995 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357

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