Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a2d231313dcab0…

MALICIOUS

PDF

56.6 KB Created: 2020-03-29 02:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 97b7eb2e66410594e5893ef0fd1cf8bc SHA-1: 2845e0ed7f044825c41a2a47fd52536bd41ade9a SHA-256: 91a2d231313dcab05269e3692a8e7c59406681b1ae4c003f032c027ac369bb72
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though partially corrupted, contains a title related to etymology and the wkhtmltopdf application, suggesting a lure. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF_SEO_LINK_FARM heuristics confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://74-123-77-70.mgwnet.com/uploads/1/3/1/3/131398374/131398374.html#origen+etimol%C3%B3gico+de+la+palabra+filosofia PDF link annotation
    • http://pamelaschneider.com/uploads/1/3/0/2/130289308/mitaj.pdfIn PDF document text
    • http://lowcountrymobility.com/uploads/1/3/0/3/130313741/lukif.pdfIn PDF document text
    • http://weinbendertextilesllc.com/uploads/1/3/0/3/130379096/mabedosixukuduxopar.pdfIn PDF document text
    • http://plussizebridalgownsinma.com/uploads/1/3/0/6/130604518/5313851.pdfIn PDF document text
    • http://rahklan.com/uploads/1/3/0/8/130874148/744224.pdfIn PDF document text
    • http://elitvatecandlecompany.com/uploads/1/3/0/5/130544448/gitamogupelumimak.pdfIn PDF document text
    • http://142ellert.com/uploads/1/3/0/8/130873994/212e22fc75bef.pdfIn PDF document text
    • http://sadtown.com/uploads/1/3/0/2/130289386/96552dece24.pdfIn PDF document text
    • http://kotor4.com/uploads/1/3/0/6/130621385/baragopataj.pdfIn PDF document text
    • http://thetribespace.org/uploads/1/3/1/3/131384256/2143054.pdfIn PDF document text
    • http://mibias.net/uploads/1/3/0/3/130379160/zapajazagol_savibuzog_suvuvuwepi.pdfIn PDF document text
    • http://whatthehulla.net/uploads/1/3/0/9/130969618/5177474.pdfIn PDF document text
    • http://thegravelhouse.com/uploads/1/3/0/2/130270748/3090844.pdfIn PDF document text
    • http://emilyschider.com/uploads/1/3/0/2/130271031/xefobopajum.pdfIn PDF document text
    • http://thurmondfarms.com/uploads/1/3/0/9/130969360/b6efb9f67250465.pdfIn PDF document text
    • http://ianexplains.net/uploads/1/3/0/6/130639199/4451729.pdfIn PDF document text
    • http://remisesugartepremium.com/uploads/1/3/0/5/130588724/6964964.pdfIn PDF document text
    • http://sophiecharlottephotography.com/uploads/1/3/0/7/130776804/1387039.pdfIn PDF document text
    • http://harrypthomas.com/uploads/1/3/0/7/130739783/6650356.pdfIn PDF document text
    • http://adaradecor.com/uploads/1/3/0/7/130775107/6d085dbd01d0b18.pdfIn PDF document text
    • http://webdisk.dickersongreenseminary.org/uploads/1/3/0/5/130551258/1498505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • 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 4

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_off0000808a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x808A 10276 bytes
SHA-256: 98b9e4644b88d0fc0ba1fc68016eec597a0152ecc94f96594a5dae801a9354ab
font_01_sfnt_off0000a42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA42E 6656 bytes
SHA-256: f95427fb53727bbd14b96593d8cc8ecad03dc2473df6941689660c224cd48d55
font_02_sfnt_off0000b7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D1 17512 bytes
SHA-256: 107edc9a50876b488b3d2c8df3f8301bc83410b0c1d5afd817b61761d4281f31

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