Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e8e10b85b9f9ce…

MALICIOUS

PDF

42.1 KB Created: 2020-03-21 01:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db8c0375a4588121a1646661a3c0fba9 SHA-1: 591f4b2a8bcdab8bf3a7f6db41bae2c0d5ae3d38 SHA-256: d5e8e10b85b9f9ce1bb409d71ed69fcdcdb00379a29104d2a7a2368af72e7080
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 to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, and the document body text is heavily obfuscated, making it difficult to determine a precise user-facing lure beyond the presence of the links.

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://wilmingtonladiesteawalk.org/uploads/1/3/0/5/130589205/130589205.html#asq+certified+quality+engineer+handbook+pdf
    • http://sharkballoon.com/uploads/1/3/0/6/130604798/tedavibepokewo.pdf
    • http://www.reproductivejusticeinitiative.com/uploads/1/3/0/5/130551449/toliwukuwewap.pdf
    • http://kbkidsaspen.com/uploads/1/3/0/5/130588315/budaro.pdf
    • http://www.rcharltontours.uk/uploads/1/3/0/2/130289418/2477433.pdf
    • http://mkayinthemountains.com/uploads/1/3/0/5/130588150/2eb4c.pdf
    • http://biopacificmexico.com/uploads/1/3/0/5/130543107/xudenozadenuge_dipiwagibepefe_nured_sokomojes.pdf
    • http://ginekologjakiel.pl/uploads/1/3/0/5/130550787/zebilufofe.pdf
    • http://rachelpendergraft.net/uploads/1/3/0/2/130288333/8084679.pdf
    • http://5banditway.com/uploads/1/3/0/7/130739502/sakajufudobopopin.pdf
    • http://www.collarsandcoffee.com/uploads/1/3/0/7/130738619/4414412.pdf
    • http://evagoren.com/uploads/1/3/0/3/130379370/gukewalik.pdf
    • http://www.empbeautytherapy.com/uploads/1/3/0/7/130740497/349423.pdf
    • http://www.sticktohim.com/uploads/1/3/0/2/130289290/e59ace5db5.pdf
    • http://116pinehill.com/uploads/1/3/0/6/130605278/lilamaxodal.pdf
    • http://nightingaleicecreamsandwiches.com/uploads/1/3/1/0/131070920/af1535f8f9cfb2d.pdf
    • http://ludgatehillpartners.com/uploads/1/3/0/5/130539637/pamexigigiru.pdf
    • http://www.thegoodstream.com/uploads/1/3/0/4/130435649/522f425.pdf
    • http://www.tf2backpack.net/uploads/1/3/0/6/130621432/norar-dajafawugop-bebir.pdf
    • http://joe-otoole-photography.com/uploads/1/3/0/6/130605206/suzute.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007023.bin
09372375027f7a7eb2445adb830d2143b7e62919c4fb9543d439da4f1efcd179
pdf-font-stream PDF embedded font (sfnt) at offset 0x7023 8016 bytes
font_01_sfnt_off00008f56.bin
c048ac4ed90d63bfae46472f65f9cf6fc0bd5e75369f2d8f28771a6d96a2731c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F56 3156 bytes