Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5a2ae041e3d5bf…

MALICIOUS

PDF

50.8 KB Created: 2020-03-10 11:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d68e289cf495babba631db121ee3ff6a SHA-1: d4061887933d98a18d8df044c6465230b4d9be1b SHA-256: 4d5a2ae041e3d5bf9cf9e1c2545aaf8114ddb66d04c52352094855c9485bc5df
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains text related to 'teaching vocabulary to esl students' and mentions the wkhtmltopdf generator, suggesting a lure to disguise the malicious link farm.

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://90w9p.salon225.com/uploads/1/3/0/4/130476720/130476720.html#teaching+vocabulary+to+esl+students PDF link annotation
    • http://mydbcommunity.com/uploads/1/3/0/4/130483550/17e4357.pdfIn PDF document text
    • http://meridiansq.com/uploads/1/3/0/2/130291699/noxopikivenujo-pofisipibefida-zazikonemoz-zireg.pdfIn PDF document text
    • http://hostmaster.tobymuse.com/uploads/1/3/0/6/130621218/puwogunovizogena.pdfIn PDF document text
    • http://burgosmarketing.com/uploads/1/3/0/8/130874012/1932487.pdfIn PDF document text
    • http://marcellastraub.com/uploads/1/3/0/3/130324236/zopawur.pdfIn PDF document text
    • http://www.woobrickbox.org/uploads/1/3/0/3/130323641/bb15e2f8.pdfIn PDF document text
    • http://shaiva.net/uploads/1/3/0/3/130323567/widojaviki_fuwojisa.pdfIn PDF document text
    • http://anneleavitte.net/uploads/1/3/0/6/130639891/sigulemukug.pdfIn PDF document text
    • http://koinlando.com/uploads/1/3/0/5/130590164/zozurofoje.pdfIn PDF document text
    • http://www.glenmorehuntpc.com/uploads/1/3/0/7/130774970/6129357.pdfIn PDF document text
    • http://archercdc.com/uploads/1/3/0/4/130488696/0b15b48d.pdfIn PDF document text
    • http://thefoundlink.org/uploads/1/3/0/4/130435784/3226654.pdfIn PDF document text
    • http://www.hfieldman.com/uploads/1/3/0/4/130476141/631629.pdfIn PDF document text
    • http://mamascook.com/uploads/1/3/0/2/130273584/08df7948d.pdfIn PDF document text
    • http://mayahairstonslampoetry.com/uploads/1/3/0/2/130272102/8145344.pdfIn PDF document text
    • http://bmplogistics.com/uploads/1/3/0/4/130436007/d18ec.pdfIn PDF document text
    • http://merakionlineradio.co.za/uploads/1/3/0/6/130604876/binudodanaxona-munoju.pdfIn PDF document text
    • http://www.rebjohnson.com/uploads/1/3/0/5/130588499/7806629.pdfIn PDF document text
    • http://vousetnousen2020.com/uploads/1/3/0/3/130379141/6563292.pdfIn PDF document text
    • http://versionalhughes.com/uploads/1/3/0/2/130272477/3916463.pdfIn PDF document text
    • http://vegaselitevb.net/uploads/1/3/0/5/130588222/punidipikibo-zevad-semonokizezotan.pdfIn PDF document text
    • http://bellesandbeausball.com/uploads/1/3/0/7/130775318/jowik.pdfIn PDF document text
    • http://coreinformation.net/uploads/1/3/0/3/130313149/075a2704883799.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d9e.bin
df1d9f787eb9de8cec6a569afcf40aed2d2de30c6e20efc73839f52c15eebe69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9E 8116 bytes

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