Malicious PDF — malware analysis report

Static analysis result for SHA-256 88565bf140b05ae2…

MALICIOUS

PDF

41.0 KB Created: 2020-06-03 15:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ac2f89ada55ca7a970a1c357fd48405 SHA-1: 86ef42ca464b12ce24510b44d84331b4aa118266 SHA-256: 88565bf140b05ae213b9b9e7ce8fbf11091e4c43cce0cdecc087e2b3cd58c893
62 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, predominantly using numeric slugs and the term 'pdf' in the URL path, suggesting a link farm or SEO spam tactic. The document body, though heavily obfuscated, also contains some of these URLs, reinforcing the idea that the primary purpose is to redirect users to a large collection of external PDF documents. No scripts were extracted from this sample.

Heuristics 3

  • 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
  • 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://cbiofrossmoor.org/uploads/1/3/1/6/131606396/131606396.html#cadastral+surveying+textbook+pdf
    • http://voipex.us/uploads/1/3/0/9/130969726/xadefatituje.pdf
    • http://rhsimb.org/uploads/1/3/1/0/131070309/2374329.pdf
    • http://premierbeachfl.com/uploads/1/3/0/7/130738623/ccb980749b7.pdf
    • http://maison-argein.info/uploads/1/3/0/7/130740590/a6c1bbd.pdf
    • http://jeremyjed.com/uploads/1/3/0/7/130739116/9339390.pdf
    • http://4azhouses.com/uploads/1/3/0/6/130621407/vubumu_monogiden.pdf
    • http://topendimgsupportnetwork.com/uploads/1/3/0/5/130550805/1830309.pdf
    • http://giltnercareers.com/uploads/1/3/0/3/130323124/pofosawuvaw.pdf
    • http://kingsandqueensny.com/uploads/1/3/0/8/130874297/576727e7627d4c.pdf
    • http://mx.therapywithtara.com/uploads/1/3/1/0/131070619/2563355.pdf
    • http://botte-boot.com/uploads/1/3/1/4/131438313/8142553.pdf
    • http://2j1.undesirable.us/uploads/1/3/0/5/130552053/xisowutafif-wovij-xadimexefodax.pdf
    • http://webmail.grinandgrowchildcare.org/uploads/1/3/1/4/131438474/wubefifinudagivonur.pdf
    • http://webmail.snowhillmd.gov/uploads/1/3/0/6/130620549/2910857.pdf
    • http://cbiofrossmoor.org/uploads/1/3/1/6/131606396/terms.html
    • http://cbiofrossmoor.org/uploads/1/3/1/6/131606396/dmca.html
    • http://cbiofrossmoor.org/uploads/1/3/1/6/131606396/policy.html
    • https://gifamadez.files.wordpress.com/2020/05/xenabebin.pdf
    • https://vasoponox.files.wordpress.com/2020/05/94432885951.pdf
    • https://digawuxedado.files.wordpress.com/2020/05/fosirugutixoragodefim.pdf
    • https://bizipom718967414.files.wordpress.com/2020/06/pojoxokugofi.pdf
    • https://merefipo.files.wordpress.com/2020/05/fewudivusumu.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_off00007292.bin
bcc829bf82b1302a904df8fec5f3c18b9356ccd6f1d56fe56e567d4a9b07a4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7292 10936 bytes

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