Malicious PDF — malware analysis report

Static analysis result for SHA-256 20054582cab09835…

MALICIOUS

PDF

39.1 KB Created: 2020-06-04 20:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb99a8bfd971f6a975f1c07536be0a96 SHA-1: 53f99b2b6ca229b375653d9b04979830ac86eac5 SHA-256: 20054582cab09835643fc0d7bdb227fb6218db86a14674d8c3f093a815a2eece
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm designed to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body text is largely obfuscated, but the presence of numerous suspicious URLs strongly suggests a malicious intent to redirect users to potentially harmful sites.

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://kvconsulting.biz/uploads/1/3/0/6/130620970/130620970.html#fisica+para+ciencias+e+ingenieria+serway+9+edicion+vol+1+pdf
    • http://pawfessionals.org/uploads/1/3/1/4/131453114/303cdb0588a.pdf
    • http://trumagick.com/uploads/1/3/0/8/130814043/wovubib_kuxofi.pdf
    • http://novarealtorconsulting.com/uploads/1/3/0/2/130289551/4492796.pdf
    • http://christianviewtv.com/uploads/1/3/1/4/131409274/lademaparo_nugenope_jegep_soledavesem.pdf
    • http://oh-m-y.org/uploads/1/3/0/7/130776649/48d831451d99b.pdf
    • http://fekienerco.com/uploads/1/3/1/6/131637430/7308d2db.pdf
    • http://cpcalendars.thesurreysaddlery.com/uploads/1/3/0/6/130604049/9667376.pdf
    • http://kvconsulting.biz/uploads/1/3/0/6/130620970/terms.html
    • http://kvconsulting.biz/uploads/1/3/0/6/130620970/dmca.html
    • http://kvconsulting.biz/uploads/1/3/0/6/130620970/policy.html
    • https://gunamitiluj.files.wordpress.com/2020/06/87530506039.pdf
    • https://relopupuxa.files.wordpress.com/2020/06/96962219002.pdf
    • https://jizijelaz994198937.files.wordpress.com/2020/06/vefabazutezezogobomizu.pdf
    • https://kedisufod.files.wordpress.com/2020/06/57410630700.pdf
    • https://vomoxutufago.files.wordpress.com/2020/06/fokimolibo.pdf
    • https://tuvivamitoti.files.wordpress.com/2020/06/mimadajapinasufukub.pdf
    • https://vebetume.files.wordpress.com/2020/06/49309879839.pdf
    • https://rilusepo.files.wordpress.com/2020/06/59803259278.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_off00006700.bin
5d1e89a1aab91c6b8ab9e55734a5762e1edc8055659ba677fd265574bcbef1b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6700 12000 bytes