Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bbc9e425ab5fff…

MALICIOUS

PDF

46.9 KB Created: 2020-03-29 14:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b8875982db1738feec8419a4d400a4f SHA-1: 7f39c6bd431b8d60d0b248baa61aafb138dcf381 SHA-256: 16bbc9e425ab5fff6658067753f5f27d17e46507f4c2625a5b64810f604be1bf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, identified as a 'PDF SEO Link Farm' heuristic. The embedded document body text, though partially corrupted, contains references to URLs that are also present in the extracted URL list. The primary function appears to be directing users to a vast collection of other PDF files hosted across numerous domains, likely for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted, but the structure strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bailigongyulechengshoujiban.br3h.com/uploads/1/3/0/8/130813490/130813490.html#california+real+estate+principles+15th+edition+walt+huber+pdf
    • http://brandisbubbles.com/uploads/1/3/0/7/130776841/5448961.pdf
    • http://mobileboutiqueadriannemerkling.com/uploads/1/3/0/2/130291556/leweloduso.pdf
    • http://neroliltd.com/uploads/1/3/0/5/130539125/lademagupikatil.pdf
    • http://ushealthplans.us/uploads/1/3/0/2/130288722/b9d3ba.pdf
    • http://realcurbappealinc.com/uploads/1/3/0/3/130323417/7270133.pdf
    • http://redtopbloomington.com/uploads/1/3/0/6/130620184/fbd20f63c42.pdf
    • http://discoverhomestores.com/uploads/1/3/1/4/131411431/21ff339111926.pdf
    • http://awakenedrose.com/uploads/1/3/1/3/131381326/4490661.pdf
    • http://kubbsjewelryandfashion.com/uploads/1/3/0/2/130287894/4727424.pdf
    • http://biscanada.org/uploads/1/3/0/7/130739227/vivaduxokufiru.pdf
    • http://wrecklessabandoninnovations.com/uploads/1/3/0/5/130589194/04aa4.pdf
    • http://sjcfol.org/uploads/1/3/0/7/130739779/supotosowosix.pdf
    • http://solarrainwatersg.com/uploads/1/3/0/8/130814050/b499de.pdf
    • http://angelscrossinghomehospice.com/uploads/1/3/0/9/130969508/191827.pdf
    • http://roxandree.com/uploads/1/3/0/4/130490386/veroganukukam.pdf
    • http://sausalitospace.com/uploads/1/3/0/5/130550782/2801125.pdf
    • http://massagethiry.net/uploads/1/3/0/5/130543063/wawanerutiwumuwexed.pdf
    • http://jjbeef.com/uploads/1/3/0/5/130588720/2567159.pdf
    • http://thegemstonegirls.com/uploads/1/3/0/7/130739256/fezajut-dibaxoreliziv-xofifofexaf.pdf
    • http://productmgr.ninja/uploads/1/3/0/6/130620290/pasarezoko.pdf
    • http://frosttechlab.com/uploads/1/3/0/9/130969086/6171239.pdf
    • http://acsellerate.biz/uploads/1/3/0/5/130542912/donife-kosujodufujobi-biruraduwetasu.pdf
    • http://armandsen.com/uploads/1/3/0/4/130488299/nilemedukod.pdf
    • http://bailbondsbuffalo.com/uploads/1/3/0/5/130541837/3492631.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_off000088ee.bin
2fe6325086722acf00c892a473b698ee3c62c4e3da94272695917494b6589674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88EE 9608 bytes

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