Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d4466f6e92e26e…

MALICIOUS

PDF

34.8 KB Created: 2020-06-03 23:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a3f875b5ec3450a55bb46155a2641c3 SHA-1: 910f3bb36b4f37cb217158c61e9ef43706be45f4 SHA-256: 81d4466f6e92e26e5f0886c5679d9a4c846d2e21bea6979ec9c5cfd0185a27d2
62 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to domains designed to mimic legitimate content, such as 'covid-19-coronavirus-vaccine.com'. The document body, though partially corrupted, suggests a lure related to 'pronouns worksheet answers'. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malware or facilitate phishing. The primary IOCs are the external URLs and the domains hosting them.

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://74-123-72-68.mgwnet.com/uploads/1/3/0/6/130639145/130639145.html#identifying+kinds+of+pronouns+worksheet+answers
    • http://stemcapelesscrusaders.com/uploads/1/3/0/2/130289341/76d8c.pdf
    • http://puredogbreedregistry.com/uploads/1/3/0/6/130621000/7621731.pdf
    • http://covid-19-coronavirus-vaccine.com/uploads/1/3/0/7/130739074/369799.pdf
    • http://theweddingaddress.com/uploads/1/3/0/5/130589297/zilaramufeli.pdf
    • http://aquasafewaterfilters.com/uploads/1/3/0/5/130543170/mobedodibuvo-vopowova-berutapitaxoxi-poxukuf.pdf
    • http://hindiausem.info/uploads/1/3/0/4/130488940/panizotatusol.pdf
    • http://lijiyulekaihu.br3h.com/uploads/1/3/1/4/131438523/sugefevaj-weseroz-memij-segap.pdf
    • http://74-123-72-68.mgwnet.com/uploads/1/3/0/6/130639145/terms.html
    • http://74-123-72-68.mgwnet.com/uploads/1/3/0/6/130639145/dmca.html
    • http://74-123-72-68.mgwnet.com/uploads/1/3/0/6/130639145/policy.html
    • https://janavojomeb.files.wordpress.com/2020/06/tagemebewatixugebedab.pdf
    • https://mapivibogivo.files.wordpress.com/2020/06/45327278359.pdf
    • https://juwafozin.files.wordpress.com/2020/06/vorefubegafebamo.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_off00005c96.bin
53ee94af9e32a66237124c8aa9ef901971d4b095226bc0dccdb9ffa56cc81dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C96 10268 bytes

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