Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6d4d5647046f04…

MALICIOUS

PDF

41.4 KB Created: 2020-03-21 16:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f69398f1840b640976fb7f655e8176b SHA-1: 2cafb139fffbded532cc7936df289fbac881feb4 SHA-256: 4c6d4d5647046f04cd0d5acf5d198989a59acb65ae85326719fd427ab05ec4b6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body contains text related to calculating inventory rotation index, but this appears to be a lure to disguise the malicious nature of the embedded links. The ML classifier strongly indicated maliciousness, and the sheer volume of outbound links suggests a link farm or redirection scheme.

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://annotalegal.com/uploads/1/3/1/0/131070498/131070498.html#formula+para+calcular+el+indice+de+rotacion+de+inventarios
    • http://karnakcomics.co.uk/uploads/1/3/0/5/130551726/datipegopedut.pdf
    • http://americanaircurtains.com/uploads/1/3/0/6/130604656/7446991.pdf
    • http://www.bold-and-italic.com/uploads/1/3/0/3/130379285/sisoluguxomej-texinet-palilusufe.pdf
    • http://hostmaster.inkbyfinch.com/uploads/1/3/0/9/130969944/xolejeraluk-bipedewekutigi.pdf
    • http://dangerouslycollaborative.com/uploads/1/3/0/5/130551095/9195789.pdf
    • http://plastidiploosdrecht.nl/uploads/1/3/0/6/130639840/fovabugetujuge.pdf
    • http://mail.doodledogs.org/uploads/1/3/0/5/130550785/lorezufilixemojil.pdf
    • http://robertchristyartist.com/uploads/1/3/0/6/130621947/netujijiniwalobozi.pdf
    • http://www.eileanjewellery.com/uploads/1/3/0/6/130639865/liwolizu_nejetidijele_deduzo.pdf
    • http://naturalgasgarbagetruck.com/uploads/1/3/0/8/130874130/xififizuvuf.pdf
    • http://abmphpa.net/uploads/1/3/0/7/130775641/98b5e.pdf
    • http://projectdreamport.net/uploads/1/3/0/3/130379381/e00a09c0447.pdf
    • http://musicaware.org/uploads/1/3/0/5/130539881/f2f67f928a.pdf
    • http://www.hannahb-photography.com/uploads/1/3/0/2/130272081/6654887.pdf
    • http://colinaway.com/uploads/1/3/0/7/130774977/aa51b07.pdf
    • http://lymeliteclothing.com/uploads/1/3/0/4/130436339/f2ef9f999.pdf
    • http://fblacrosse.com/uploads/1/3/0/2/130289532/8874176.pdf
    • http://brandonmgraham.com/uploads/1/3/0/3/130323642/bf3b1b7a4b.pdf
    • http://cpanel.sandysdelipizza.com/uploads/1/3/1/0/131069997/3c1d61953.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_off0000766b.bin
bae7ad2ccfb42049d44a6cb8242deb02371d039572dba81031095018e11ade56
pdf-font-stream PDF embedded font (sfnt) at offset 0x766B 8660 bytes