Malicious PDF — malware analysis report

Static analysis result for SHA-256 5927d56c4cae31ee…

MALICIOUS

PDF

40.9 KB Authoring application: OpenOffice Draw
MD5: a516d4a7226037b9cd4d2b03b71d883c SHA-1: 3f27be0faa071d4a9341528799005866c90f693e SHA-256: 5927d56c4cae31ee101d4f63a2b78987b158a7dc1f92772bd344f136fd20139c
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious. The primary attack pattern appears to be SEO poisoning or a phishing lure, directing users to a multitude of PDF files hosted on various domains. No scripts were extracted from this sample.

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://blondeysblog.com/uploads/1/3/0/2/130289519/b8c0f7c97fa5d.pdf
    • http://wilorevoz.exale.pw/uploads/2020/01/29/cc3f174a.pdf
    • https://polimibup.weebly.com/uploads/1/3/0/4/130435637/eae625ef7565b.pdf
    • http://mybluejeansbookkeeping.com/uploads/1/3/0/6/130639613/2392402.pdf
    • http://ateachersplace.com/uploads/1/3/0/3/130313026/bojeg-tibixugif-siwajopuzedorig-sulenomufawakov.pdf
    • http://mylatestfavoritething.com/uploads/2020/01/27/feranutumo-zinelumepi-vasapabesejud-fifetevax.pdf
    • http://oilsfortriathletes.com/uploads/1/3/0/6/130639153/lifoses_zulujuvilasunut.pdf
    • http://narrinspiceandsauce.com/uploads/1/3/0/4/130435690/wexetevalez.pdf
    • http://alunlennon.com/uploads/1/3/0/5/130588509/vaginifonabix_lepikonodukafuk.pdf
    • https://rosagalujuled.weebly.com/uploads/1/3/0/4/130435914/negedu-lafukogugagedu-delaj-dajen.pdf
    • http://zaja.kqroup.ru/uploads/2020/01/28/supuzemagafilidez.pdf
    • http://geoffwehmeyer.com/uploads/1/3/0/5/130545643/ramipesaluve.pdf
    • http://butosaroko.fxtradeltd.info/uploads/2020/01/28/kiralutadigeme-latuwokiza-beralalu.pdf
    • http://100wwclickingcounty.org/uploads/1/3/0/3/130313159/xuriporu.pdf
    • http://cabinpr.com/uploads/1/3/0/4/130476068/gixovuwafibikixonozu.pdf
    • http://frisbeegloves.com/uploads/1/3/0/5/130551675/domujedetufa.pdf
    • http://michaelshusko.com/uploads/1/3/0/6/130603948/130603948.html#estimating+large+numbers+worksheet+answers

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000159b.bin
bd7c79b02fbb843d4a5f282ea2198e37b8c0db312ef04f35d04586ab89c259d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159B 8880 bytes
font_01_sfnt_off000063af.bin
e2a609504f31aba74360c8f97aead3d8f97c76e888a653261413c8bef59e3205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AF 2884 bytes

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