Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afb50ba48ae2f8c…

MALICIOUS

PDF

42.6 KB Created: 2020-03-29 08:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23df56c0b25f6ca6bf018a7d0b992a61 SHA-1: b82ee03e5762492a4bd1f3e1c0671aff493f7e1f SHA-256: 1afb50ba48ae2f8cc6bc1112b16001acea17bc0ca8810071289436478f308b0f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files. This suggests a link farm designed to drive traffic to malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown-reputation URLs reinforces this assessment. No scripts were extracted from this sample.

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://adsl-63-204-18-21.benefitplans.org/uploads/1/3/0/6/130605248/130605248.html#graco+size4me+65+finch
    • http://vir2al-ag.ca/uploads/1/3/0/7/130738607/xeruwomasa-bonox-bufizube-pajukotuzor.pdf
    • http://rosenblattrealestate.com/uploads/1/3/0/5/130588906/6b20177.pdf
    • http://xerocovers.com/uploads/1/3/0/6/130603884/kazirekuteverag.pdf
    • http://touvabien.net/uploads/1/3/0/4/130476896/9060148.pdf
    • http://cpanel.octantnavigates.com/uploads/1/3/0/6/130604210/475064.pdf
    • http://yellowgroup2.com/uploads/1/3/0/4/130476150/lijezawapigu-xagulanif-nukopadafi.pdf
    • http://www.concept-liner.fr/uploads/1/3/0/7/130775103/fareperivibujokejim.pdf
    • http://macroproject.net/uploads/1/3/0/4/130488810/vatevujalosu_sediri_turekiziw_netojuvi.pdf
    • http://sembrandofe.com/uploads/1/3/0/3/130323374/nelovuluk-dawixiz.pdf
    • http://aufstehen-gegen-linksfaschismus.org/uploads/1/3/0/2/130271131/8767881.pdf
    • http://idonutcare.net/uploads/1/3/0/6/130621458/jirawodixipusu.pdf
    • http://www.qacollective.com/uploads/1/3/0/4/130483770/rodulasos.pdf
    • http://anthonymassarotto.com/uploads/1/3/0/5/130589220/3b31f.pdf
    • http://admin.hmunc.org/uploads/1/3/0/4/130478935/1474590.pdf
    • http://www.justgrindlifestyleapparel.com/uploads/1/3/0/5/130588650/5a6150ae2d571.pdf
    • http://levy.team/uploads/1/3/0/2/130289800/691167909449c8.pdf
    • http://graduationtoretirement.com/uploads/1/3/0/7/130776196/tokikor_lazogezaz.pdf
    • http://calesmith.ca/uploads/1/3/0/8/130814980/bazewinigejosebot.pdf
    • http://katysullivanartistry.com/uploads/1/3/0/5/130551064/kubijudulibibi.pdf
    • http://pointandstretch.org/uploads/1/3/0/5/130540525/datinidepowawonif.pdf
    • http://autoposst.com/uploads/1/3/0/4/130483872/1673096.pdf
    • http://leadtheway394.com/uploads/1/3/0/5/130588490/3c29527d00.pdf
    • http://consultoriaconsciente.com/uploads/1/3/0/2/130270889/2076216.pdf
    • http://webmail.maderakubo.com/uploads/1/3/0/3/130313200/taxalilapanokup-wuxev.pdf
    • http://spatzen.hu/uploads/1/3/0/3/130313755/jekijedasiwuzek-paxanuron.pdf
    • http://webmail.maderakubo.com/upload
    • 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_off000079a1.bin
5a3eb6afe5db5f096c43fbb28105add82a51a419dcd18dc0147cdf4f114bfa6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A1 8736 bytes

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