Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89a9e08b3123efd…

MALICIOUS

PDF

36.8 KB Created: 2020-04-02 11:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 289c04adcb242bb75b937568dafdd725 SHA-1: 982d3249cb77e755eb668f33fcc487025b2dbedb SHA-256: a89a9e08b3123efd5f593eae05ccc043869acd963dcc9037d5021547228d7ae2
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content, rather than providing legitimate information.

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://topcoatdesign.net/uploads/1/3/0/7/130775180/130775180.html#que+es+suma+de+polinomios+y+ejemplos
    • http://jetsetnomad.shop/uploads/1/3/0/2/130271139/pidubuzu-modosizetem.pdf
    • http://fun4kidsbrincolines.com/uploads/1/3/0/5/130590403/jeniz.pdf
    • http://familymeeting2019.com/uploads/1/3/0/7/130739837/zewugefazimu_xamojabejugexa.pdf
    • http://creapoponline.com/uploads/1/3/0/6/130621470/wozonagej_dujomogejanap.pdf
    • http://stackastorybookshop.net/uploads/1/3/0/3/130379803/73f0e9408471677.pdf
    • http://bluesands242.com/uploads/1/3/0/5/130588290/8aee3318bc1f.pdf
    • http://vaplc.com/uploads/1/3/1/4/131406528/dotudorimidedi-moziruguvovaron-borivotadixit-kigemuwuwinef.pdf
    • http://utpsych.com/uploads/1/3/0/4/130488370/1652734.pdf
    • http://todosobrecarpas.com/uploads/1/3/0/8/130814666/xegefekawadadi-xigupozogogeson.pdf
    • http://soulcoachlisa.com/uploads/1/3/0/9/130969999/sabajune.pdf
    • http://shishkebobscafe.com/uploads/1/3/1/4/131406966/gojojomebobogewut.pdf
    • http://airpass.cz/uploads/1/3/0/7/130775401/fegepikam.pdf
    • http://mywoodshop.co/uploads/1/3/0/5/130550774/725d4cee7614.pdf
    • http://kapaconsult.be/uploads/1/3/0/5/130589276/pigusadoviwovab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656c.bin
3a931209f0ddc77484cfb6b1566b7b6082b3032a4774790192870177e9a0f009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656C 8440 bytes

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