Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21b4bac72057e70…

MALICIOUS

PDF

48.1 KB Authoring application: PDFedit
MD5: 364964e2058e6681418172a17cc7e4d6 SHA-1: 3479320ec3d2b8a2ebb10e678a09cccf9046493d SHA-256: f21b4bac72057e706ddf6030db35f7d1f2b54ee752bc1f6204fd5b3105118e34
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body text is largely unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://cpanel.eastportfinancialgroup.com/uploads/1/3/0/4/130477018/0e92aba6d69.pdf
    • http://soundunit.de/uploads/1/3/0/5/130540178/nujurorafifixapave.pdf
    • http://mx.nwbookkeepingservices.com/uploads/1/3/0/6/130621587/pefijoko.pdf
    • http://hunnycombevents.com/uploads/1/3/0/6/130604104/8928891.pdf
    • http://www.fluidresidential.com/uploads/1/3/0/7/130739529/7132554.pdf
    • http://moonlightgraphics65.com/uploads/1/3/0/4/130490687/doputukuxo-ketumavafugozo-nogagosipo-firibixefulukor.pdf
    • http://ms-holly-hagman.com/uploads/1/3/0/6/130639178/larizolonubupeb_wakelogojufipam.pdf
    • http://ghdate.com/uploads/1/3/0/8/130814416/bibinojuroxezadogite.pdf
    • http://gridforce.us/uploads/1/3/0/2/130288522/zuwotisetudapezumim.pdf
    • http://www.thebiblionista.com/uploads/1/3/0/7/130775749/05599dc43214.pdf
    • http://phsmostl.com/uploads/1/3/0/3/130323754/8a8fbf46f994b1.pdf
    • http://www.ludlowvtencomium.com/uploads/1/3/0/6/130603903/sidotigin.pdf
    • http://www.claponline.org/uploads/1/3/0/4/130435990/2872423.pdf
    • http://multiples.media/uploads/1/3/0/4/130488847/titofufizuf_gijomamijeza.pdf
    • http://theleftsock.com/uploads/1/3/0/8/130874231/vajutid_pajolik_romosi_zagid.pdf
    • http://sweetwaternetworks.com/uploads/1/3/0/5/130544147/kenivat.pdf
    • http://mx70.farmfreshsoaps.com/uploads/1/3/0/6/130604351/45cad.pdf
    • http://setisabogados.com/uploads/1/3/0/9/130969080/4469c2.pdf
    • http://corporateeventphoto.com/uploads/1/3/0/6/130621283/855910.pdf
    • http://meiguodaxiyangcheng.f18.ebkf.org/uploads/1/3/0/6/130621853/e6ce41b066f3.pdf
    • http://claycountyedc.com/uploads/1/3/0/7/130740003/rekusadibanelo.pdf
    • http://74-123-73-134.mgwnet.com/uploads/1/3/0/4/130489465/130489465.html#comment+exporter+un+fichier+excel+2007+en+pdf
    • http://mx.nwbookkeepingservices.com/uploads/1/3/0/6/130621587/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a12.bin
0d396bc092e8ba70d5f731d511d6c471f532e693c4efe603b27c7dae8c66022c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A12 9080 bytes

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